src/window_gui.h

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file window_gui.h Functions, definitions and such used only by the GUI. */
  11
  12 #ifndef WINDOW_GUI_H
  13 #define WINDOW_GUI_H
  14
  15 #include "vehicle_type.h"
  16 #include "viewport_type.h"
  17 #include "company_type.h"
  18 #include "tile_type.h"
  19 #include "widget_type.h"
  20 #include "station_base.h"
  21 #include "core/smallvec_type.hpp"
  22 #include "core/smallmap_type.hpp"
  23 #include "string_type.h"
  24 #include "station_type.h"
  25
  26 /**
  27  * Flags to describe the look of the frame
  28  */
  29 enum FrameFlags {
  30         FR_NONE         =  0,
  31         FR_TRANSPARENT  =  1 << 0,  ///< Makes the background transparent if set
  32         FR_BORDERONLY   =  1 << 4,  ///< Draw border only, no background
  33         FR_LOWERED      =  1 << 5,  ///< If set the frame is lowered and the background colour brighter (ie. buttons when pressed)
  34         FR_DARKENED     =  1 << 6,  ///< If set the background is darker, allows for lowered frames with normal background colour when used with FR_LOWERED (ie. dropdown boxes)
  35 };
  36
  37 DECLARE_ENUM_AS_BIT_SET(FrameFlags)
  38
  39 /** Distances used in drawing widgets. */
  40 enum WidgetDrawDistances {
  41         /* WWT_IMGBTN(_2) */
  42         WD_IMGBTN_LEFT    = 1,      ///< Left offset of the image in the button.
  43         WD_IMGBTN_RIGHT   = 2,      ///< Right offset of the image in the button.
  44         WD_IMGBTN_TOP     = 1,      ///< Top offset of image in the button.
  45         WD_IMGBTN_BOTTOM  = 2,      ///< Bottom offset of image in the button.
  46
  47         /* WWT_INSET */
  48         WD_INSET_LEFT  = 2,         ///< Left offset of string.
  49         WD_INSET_RIGHT = 2,         ///< Right offset of string.
  50         WD_INSET_TOP   = 1,         ///< Top offset of string.
  51
  52         WD_SCROLLBAR_LEFT   = 2,    ///< Left offset of scrollbar.
  53         WD_SCROLLBAR_RIGHT  = 2,    ///< Right offset of scrollbar.
  54         WD_SCROLLBAR_TOP    = 2,    ///< Top offset of scrollbar.
  55         WD_SCROLLBAR_BOTTOM = 2,    ///< Bottom offset of scrollbar.
  56
  57         /* Size of the pure frame bevel without any padding. */
  58         WD_BEVEL_LEFT       = 1,    ///< Width of left bevel border.
  59         WD_BEVEL_RIGHT      = 1,    ///< Width of right bevel border.
  60         WD_BEVEL_TOP        = 1,    ///< Height of top bevel border.
  61         WD_BEVEL_BOTTOM     = 1,    ///< Height of bottom bevel border.
  62
  63         /* FrameRect widgets, all text buttons, panel, editbox */
  64         WD_FRAMERECT_LEFT   = 2,    ///< Offset at left to draw the frame rectangular area
  65         WD_FRAMERECT_RIGHT  = 2,    ///< Offset at right to draw the frame rectangular area
  66         WD_FRAMERECT_TOP    = 1,    ///< Offset at top to draw the frame rectangular area
  67         WD_FRAMERECT_BOTTOM = 1,    ///< Offset at bottom to draw the frame rectangular area
  68
  69         /* Extra space at top/bottom of text panels */
  70         WD_TEXTPANEL_TOP    = 6,    ///< Offset at top to draw above the text
  71         WD_TEXTPANEL_BOTTOM = 6,    ///< Offset at bottom to draw below the text
  72
  73         /* WWT_FRAME */
  74         WD_FRAMETEXT_LEFT   = 6,    ///< Left offset of the text of the frame.
  75         WD_FRAMETEXT_RIGHT  = 6,    ///< Right offset of the text of the frame.
  76         WD_FRAMETEXT_TOP    = 6,    ///< Top offset of the text of the frame
  77         WD_FRAMETEXT_BOTTOM = 6,    ///< Bottom offset of the text of the frame
  78
  79         /* WWT_MATRIX */
  80         WD_MATRIX_LEFT   = 2,       ///< Offset at left of a matrix cell.
  81         WD_MATRIX_RIGHT  = 2,       ///< Offset at right of a matrix cell.
  82         WD_MATRIX_TOP    = 3,       ///< Offset at top of a matrix cell.
  83         WD_MATRIX_BOTTOM = 1,       ///< Offset at bottom of a matrix cell.
  84
  85         /* WWT_SHADEBOX */
  86         WD_SHADEBOX_WIDTH  = 12,    ///< Width of a standard shade box widget.
  87         WD_SHADEBOX_LEFT   = 2,     ///< Left offset of shade sprite.
  88         WD_SHADEBOX_RIGHT  = 2,     ///< Right offset of shade sprite.
  89         WD_SHADEBOX_TOP    = 3,     ///< Top offset of shade sprite.
  90         WD_SHADEBOX_BOTTOM = 3,     ///< Bottom offset of shade sprite.
  91
  92         /* WWT_STICKYBOX */
  93         WD_STICKYBOX_WIDTH  = 12,   ///< Width of a standard sticky box widget.
  94         WD_STICKYBOX_LEFT   = 2,    ///< Left offset of sticky sprite.
  95         WD_STICKYBOX_RIGHT  = 2,    ///< Right offset of sticky sprite.
  96         WD_STICKYBOX_TOP    = 3,    ///< Top offset of sticky sprite.
  97         WD_STICKYBOX_BOTTOM = 3,    ///< Bottom offset of sticky sprite.
  98
  99         /* WWT_DEBUGBOX */
 100         WD_DEBUGBOX_WIDTH  = 12,    ///< Width of a standard debug box widget.
 101         WD_DEBUGBOX_LEFT   = 2,     ///< Left offset of debug sprite.
 102         WD_DEBUGBOX_RIGHT  = 2,     ///< Right offset of debug sprite.
 103         WD_DEBUGBOX_TOP    = 3,     ///< Top offset of debug sprite.
 104         WD_DEBUGBOX_BOTTOM = 3,     ///< Bottom offset of debug sprite.
 105
 106         /* WWT_DEFSIZEBOX */
 107         WD_DEFSIZEBOX_WIDTH  = 12,  ///< Width of a standard defsize box widget.
 108         WD_DEFSIZEBOX_LEFT   = 2,   ///< Left offset of defsize sprite.
 109         WD_DEFSIZEBOX_RIGHT  = 2,   ///< Right offset of defsize sprite.
 110         WD_DEFSIZEBOX_TOP    = 3,   ///< Top offset of defsize sprite.
 111         WD_DEFSIZEBOX_BOTTOM = 3,   ///< Bottom offset of defsize sprite.
 112
 113         /* WWT_RESIZEBOX */
 114         WD_RESIZEBOX_WIDTH  = 12,   ///< Width of a resize box widget.
 115         WD_RESIZEBOX_LEFT   = 3,    ///< Left offset of resize sprite.
 116         WD_RESIZEBOX_RIGHT  = 2,    ///< Right offset of resize sprite.
 117         WD_RESIZEBOX_TOP    = 3,    ///< Top offset of resize sprite.
 118         WD_RESIZEBOX_BOTTOM = 2,    ///< Bottom offset of resize sprite.
 119
 120         /* WWT_CLOSEBOX */
 121         WD_CLOSEBOX_WIDTH  = 11,    ///< Width of a close box widget.
 122         WD_CLOSEBOX_LEFT   = 2,     ///< Left offset of closebox string.
 123         WD_CLOSEBOX_RIGHT  = 1,     ///< Right offset of closebox string.
 124         WD_CLOSEBOX_TOP    = 2,     ///< Top offset of closebox string.
 125         WD_CLOSEBOX_BOTTOM = 2,     ///< Bottom offset of closebox string.
 126
 127         /* WWT_CAPTION */
 128         WD_CAPTION_HEIGHT     = 14, ///< Height of a title bar.
 129         WD_CAPTIONTEXT_LEFT   = 2,  ///< Offset of the caption text at the left.
 130         WD_CAPTIONTEXT_RIGHT  = 2,  ///< Offset of the caption text at the right.
 131         WD_CAPTIONTEXT_TOP    = 2,  ///< Offset of the caption text at the top.
 132         WD_CAPTIONTEXT_BOTTOM = 2,  ///< Offset of the caption text at the bottom.
 133
 134         /* Dropdown widget. */
 135         WD_DROPDOWN_HEIGHT     = 12, ///< Height of a drop down widget.
 136         WD_DROPDOWNTEXT_LEFT   = 2,  ///< Left offset of the dropdown widget string.
 137         WD_DROPDOWNTEXT_RIGHT  = 2,  ///< Right offset of the dropdown widget string.
 138         WD_DROPDOWNTEXT_TOP    = 1,  ///< Top offset of the dropdown widget string.
 139         WD_DROPDOWNTEXT_BOTTOM = 1,  ///< Bottom offset of the dropdown widget string.
 140
 141         WD_PAR_VSEP_NORMAL = 2,      ///< Normal amount of vertical space between two paragraphs of text.
 142         WD_PAR_VSEP_WIDE   = 8,      ///< Large amount of vertical space between two paragraphs of text.
 143 };
 144
 145 /* widget.cpp */
 146 void DrawFrameRect(int left, int top, int right, int bottom, Colours colour, FrameFlags flags);
 147 void DrawCaption(const Rect &r, Colours colour, Owner owner, StringID str);
 148
 149 /* window.cpp */
 150 extern Window *_z_front_window;
 151 extern Window *_z_back_window;
 152 extern Window *_focused_window;
 153
 154 inline uint64 GetWindowUpdateNumber()
 155 {
 156         extern uint64 _window_update_number;
 157         return _window_update_number;
 158 }
 159
 160 inline void IncrementWindowUpdateNumber()
 161 {
 162         extern uint64 _window_update_number;
 163         _window_update_number++;
 164 }
 165
 166
 167 /** How do we the window to be placed? */
 168 enum WindowPosition {
 169         WDP_MANUAL,        ///< Manually align the window (so no automatic location finding)
 170         WDP_AUTO,          ///< Find a place automatically
 171         WDP_CENTER,        ///< Center the window
 172         WDP_ALIGN_TOOLBAR, ///< Align toward the toolbar
 173 };
 174
 175 Point GetToolbarAlignedWindowPosition(int window_width);
 176
 177 struct HotkeyList;
 178
 179 /**
 180  * High level window description
 181  */
 182 struct WindowDesc {
 183
 184         WindowDesc(WindowPosition default_pos, const char *ini_key, int16 def_width_trad, int16 def_height_trad,
 185                         WindowClass window_class, WindowClass parent_class, uint32 flags,
 186                         const NWidgetPart *nwid_parts, int16 nwid_length, HotkeyList *hotkeys = nullptr);
 187
 188         ~WindowDesc();
 189
 190         WindowPosition default_pos;    ///< Preferred position of the window. @see WindowPosition()
 191         WindowClass cls;               ///< Class of the window, @see WindowClass.
 192         WindowClass parent_cls;        ///< Class of the parent window. @see WindowClass
 193         const char *ini_key;           ///< Key to store window defaults in openttd.cfg. \c nullptr if nothing shall be stored.
 194         uint32 flags;                  ///< Flags. @see WindowDefaultFlag
 195         const NWidgetPart *nwid_parts; ///< Nested widget parts describing the window.
 196         int16 nwid_length;             ///< Length of the #nwid_parts array.
 197         HotkeyList *hotkeys;           ///< Hotkeys for the window.
 198
 199         bool pref_sticky;              ///< Preferred stickyness.
 200         int16 pref_width;              ///< User-preferred width of the window. Zero if unset.
 201         int16 pref_height;             ///< User-preferred height of the window. Zero if unset.
 202
 203         int16 GetDefaultWidth() const;
 204         int16 GetDefaultHeight() const;
 205
 206         static void LoadFromConfig();
 207         static void SaveToConfig();
 208
 209 private:
 210         int16 default_width_trad;      ///< Preferred initial width of the window (pixels at 1x zoom).
 211         int16 default_height_trad;     ///< Preferred initial height of the window (pixels at 1x zoom).
 212
 213         /**
 214          * Dummy private copy constructor to prevent compilers from
 215          * copying the structure, which fails due to _window_descs.
 216          */
 217         WindowDesc(const WindowDesc &other);
 218 };
 219
 220 /**
 221  * Window default widget/window handling flags
 222  */
 223 enum WindowDefaultFlag {
 224         WDF_CONSTRUCTION    =   1 << 0, ///< This window is used for construction; close it whenever changing company.
 225         WDF_MODAL           =   1 << 1, ///< The window is a modal child of some other window, meaning the parent is 'inactive'
 226         WDF_NO_FOCUS        =   1 << 2, ///< This window won't get focus/make any other window lose focus when click
 227 };
 228
 229 /**
 230  * Data structure for resizing a window
 231  */
 232 struct ResizeInfo {
 233         uint step_width;  ///< Step-size of width resize changes
 234         uint step_height; ///< Step-size of height resize changes
 235 };
 236
 237 /** State of a sort direction button. */
 238 enum SortButtonState {
 239         SBS_OFF,  ///< Do not sort (with this button).
 240         SBS_DOWN, ///< Sort ascending.
 241         SBS_UP,   ///< Sort descending.
 242 };
 243
 244 /**
 245  * Window flags.
 246  */
 247 enum WindowFlags {
 248         WF_TIMEOUT           = 1 <<  0, ///< Window timeout counter.
 249
 250         WF_DRAGGING          = 1 <<  3, ///< Window is being dragged.
 251         WF_SIZING_RIGHT      = 1 <<  4, ///< Window is being resized towards the right.
 252         WF_SIZING_LEFT       = 1 <<  5, ///< Window is being resized towards the left.
 253         WF_SIZING            = WF_SIZING_RIGHT | WF_SIZING_LEFT, ///< Window is being resized.
 254         WF_STICKY            = 1 <<  6, ///< Window is made sticky by user
 255         WF_DISABLE_VP_SCROLL = 1 <<  7, ///< Window does not do autoscroll, @see HandleAutoscroll().
 256         WF_WHITE_BORDER      = 1 <<  8, ///< Window white border counter bit mask.
 257         WF_HIGHLIGHTED       = 1 <<  9, ///< Window has a widget that has a highlight.
 258         WF_CENTERED          = 1 << 10, ///< Window is centered and shall stay centered after ReInit.
 259 };
 260 DECLARE_ENUM_AS_BIT_SET(WindowFlags)
 261
 262 static const int TIMEOUT_DURATION = 7; ///< The initial timeout value for WF_TIMEOUT.
 263 static const int WHITE_BORDER_DURATION = 3; ///< The initial timeout value for WF_WHITE_BORDER.
 264
 265 /**
 266  * Data structure for a window viewport.
 267  * A viewport is either following a vehicle (its id in then in #follow_vehicle), or it aims to display a specific
 268  * location #dest_scrollpos_x, #dest_scrollpos_y (#follow_vehicle is then #INVALID_VEHICLE).
 269  * The actual location being shown is #scrollpos_x, #scrollpos_y.
 270  * @see InitializeViewport(), UpdateViewportPosition(), UpdateViewportCoordinates().
 271  */
 272 struct ViewportData : ViewPort {
 273         VehicleID follow_vehicle; ///< VehicleID to follow if following a vehicle, #INVALID_VEHICLE otherwise.
 274         int32 scrollpos_x;        ///< Currently shown x coordinate (virtual screen coordinate of topleft corner of the viewport).
 275         int32 scrollpos_y;        ///< Currently shown y coordinate (virtual screen coordinate of topleft corner of the viewport).
 276         int32 dest_scrollpos_x;   ///< Current destination x coordinate to display (virtual screen coordinate of topleft corner of the viewport).
 277         int32 dest_scrollpos_y;   ///< Current destination y coordinate to display (virtual screen coordinate of topleft corner of the viewport).
 278 };
 279
 280 struct QueryString;
 281
 282 /* misc_gui.cpp */
 283 enum TooltipCloseCondition {
 284         TCC_RIGHT_CLICK,
 285         TCC_LEFT_CLICK,
 286         TCC_HOVER,
 287 };
 288 void GuiShowTooltips(Window *parent, StringID str, TooltipCloseCondition close_tooltip = TCC_HOVER);
 289 void GuiShowTooltips(Window *parent, const char *str, TooltipCloseCondition close_tooltip = TCC_HOVER);
 290 void GuiShowTooltipsForTile(Window *parent, TileIndex tile, TooltipCloseCondition close_tooltip = TCC_HOVER);
 291 void GetTileTooltipsForStation(StationID sid, char *buff, const char *last);
 292
 293
 294 /**
 295  * Data structure for an opened window
 296  */
 297 struct Window : ZeroedMemoryAllocator {
 298 protected:
 299         void InitializeData(WindowNumber window_number);
 300         void InitializePositionSize(int x, int y, int min_width, int min_height);
 301         virtual void FindWindowPlacementAndResize(int def_width, int def_height);
 302
 303         SmallVector<int, 4> scheduled_invalidation_data;  ///< Data of scheduled OnInvalidateData() calls.
 304
 305 public:
 306         Window(WindowDesc *desc);
 307
 308         virtual ~Window();
 309
 310         /**
 311          * Helper allocation function to disallow something.
 312          * Don't allow arrays; arrays of Windows are pointless as you need
 313          * to destruct them all at the same time too, which is kinda hard.
 314          * @param size the amount of space not to allocate
 315          */
 316         inline void *operator new[](size_t size)
 317         {
 318                 NOT_REACHED();
 319         }
 320
 321         /**
 322          * Helper allocation function to disallow something.
 323          * Don't free the window directly; it corrupts the linked list when iterating
 324          * @param ptr the pointer not to free
 325          */
 326         inline void operator delete(void *ptr)
 327         {
 328         }
 329
 330         WindowDesc *window_desc;    ///< Window description
 331         WindowFlags flags;          ///< Window flags
 332         WindowClass window_class;   ///< Window class
 333         WindowNumber window_number; ///< Window number within the window class
 334
 335         uint8 timeout_timer;      ///< Timer value of the WF_TIMEOUT for flags.
 336         uint8 white_border_timer; ///< Timer value of the WF_WHITE_BORDER for flags.
 337
 338         int left;   ///< x position of left edge of the window
 339         int top;    ///< y position of top edge of the window
 340         int width;  ///< width of the window (number of pixels to the right in x direction)
 341         int height; ///< Height of the window (number of pixels down in y direction)
 342
 343         ResizeInfo resize;  ///< Resize information
 344
 345         Owner owner;        ///< The owner of the content shown in this window. Company colour is acquired from this variable.
 346
 347         ViewportData *viewport;          ///< Pointer to viewport data, if present.
 348         const NWidgetCore *nested_focus; ///< Currently focused nested widget, or \c nullptr if no nested widget has focus.
 349         SmallMap<int, QueryString*> querystrings; ///< QueryString associated to WWT_EDITBOX widgets.
 350         NWidgetBase *nested_root;        ///< Root of the nested tree.
 351         NWidgetBase **nested_array;      ///< Array of pointers into the tree. Do not access directly, use #Window::GetWidget() instead.
 352         uint nested_array_size;          ///< Size of the nested array.
 353         NWidgetStacked *shade_select;    ///< Selection widget (#NWID_SELECTION) to use for shading the window. If \c nullptr, window cannot shade.
 354         Dimension unshaded_size;         ///< Last known unshaded size (only valid while shaded).
 355
 356         int scrolling_scrollbar;         ///< Widgetindex of just being dragged scrollbar. -1 if none is active.
 357
 358         Window *parent;                  ///< Parent window.
 359         Window *z_front;                 ///< The window in front of us in z-order.
 360         Window *z_back;                  ///< The window behind us in z-order.
 361
 362         template <class NWID>
 363         inline const NWID *GetWidget(uint widnum) const;
 364         template <class NWID>
 365         inline NWID *GetWidget(uint widnum);
 366
 367         const Scrollbar *GetScrollbar(uint widnum) const;
 368         Scrollbar *GetScrollbar(uint widnum);
 369
 370         const QueryString *GetQueryString(uint widnum) const;
 371         QueryString *GetQueryString(uint widnum);
 372
 373         virtual const char *GetFocusedText() const;
 374         virtual const char *GetCaret() const;
 375         virtual const char *GetMarkedText(size_t *length) const;
 376         virtual Point GetCaretPosition() const;
 377         virtual Rect GetTextBoundingRect(const char *from, const char *to) const;
 378         virtual const char *GetTextCharacterAtPosition(const Point &pt) const;
 379
 380         void InitNested(WindowNumber number = 0);
 381         void CreateNestedTree(bool fill_nested = true);
 382         void FinishInitNested(WindowNumber window_number = 0);
 383
 384         /**
 385          * Set the timeout flag of the window and initiate the timer.
 386          */
 387         inline void SetTimeout()
 388         {
 389                 this->flags |= WF_TIMEOUT;
 390                 this->timeout_timer = TIMEOUT_DURATION;
 391         }
 392
 393         /**
 394          * Set the timeout flag of the window and initiate the timer.
 395          */
 396         inline void SetWhiteBorder()
 397         {
 398                 this->flags |= WF_WHITE_BORDER;
 399                 this->white_border_timer = WHITE_BORDER_DURATION;
 400         }
 401
 402         void DisableAllWidgetHighlight();
 403         void SetWidgetHighlight(byte widget_index, TextColour highlighted_colour);
 404         bool IsWidgetHighlighted(byte widget_index) const;
 405
 406         /**
 407          * Sets the enabled/disabled status of a widget.
 408          * By default, widgets are enabled.
 409          * On certain conditions, they have to be disabled.
 410          * @param widget_index index of this widget in the window
 411          * @param disab_stat status to use ie: disabled = true, enabled = false
 412          */
 413         inline void SetWidgetDisabledState(byte widget_index, bool disab_stat)
 414         {
 415                 assert(widget_index < this->nested_array_size);
 416                 if (this->nested_array[widget_index] != nullptr) this->GetWidget<NWidgetCore>(widget_index)->SetDisabled(disab_stat);
 417         }
 418
 419         /**
 420          * Sets a widget to disabled.
 421          * @param widget_index index of this widget in the window
 422          */
 423         inline void DisableWidget(byte widget_index)
 424         {
 425                 SetWidgetDisabledState(widget_index, true);
 426         }
 427
 428         /**
 429          * Sets a widget to Enabled.
 430          * @param widget_index index of this widget in the window
 431          */
 432         inline void EnableWidget(byte widget_index)
 433         {
 434                 SetWidgetDisabledState(widget_index, false);
 435         }
 436
 437         /**
 438          * Gets the enabled/disabled status of a widget.
 439          * @param widget_index index of this widget in the window
 440          * @return status of the widget ie: disabled = true, enabled = false
 441          */
 442         inline bool IsWidgetDisabled(byte widget_index) const
 443         {
 444                 assert(widget_index < this->nested_array_size);
 445                 return this->GetWidget<NWidgetCore>(widget_index)->IsDisabled();
 446         }
 447
 448         /**
 449          * Check if given widget is focused within this window
 450          * @param widget_index : index of the widget in the window to check
 451          * @return true if given widget is the focused window in this window
 452          */
 453         inline bool IsWidgetFocused(byte widget_index) const
 454         {
 455                 return this->nested_focus != nullptr && this->nested_focus->index == widget_index;
 456         }
 457
 458         /**
 459          * Check if given widget has user input focus. This means that both the window
 460          * has focus and that the given widget has focus within the window.
 461          * @param widget_index : index of the widget in the window to check
 462          * @return true if given widget is the focused window in this window and this window has focus
 463          */
 464         inline bool IsWidgetGloballyFocused(byte widget_index) const
 465         {
 466                 return _focused_window == this && IsWidgetFocused(widget_index);
 467         }
 468
 469         /**
 470          * Sets the lowered/raised status of a widget.
 471          * @param widget_index index of this widget in the window
 472          * @param lowered_stat status to use ie: lowered = true, raised = false
 473          */
 474         inline void SetWidgetLoweredState(byte widget_index, bool lowered_stat)
 475         {
 476                 assert(widget_index < this->nested_array_size);
 477                 this->GetWidget<NWidgetCore>(widget_index)->SetLowered(lowered_stat);
 478         }
 479
 480         /**
 481          * Invert the lowered/raised  status of a widget.
 482          * @param widget_index index of this widget in the window
 483          */
 484         inline void ToggleWidgetLoweredState(byte widget_index)
 485         {
 486                 assert(widget_index < this->nested_array_size);
 487                 bool lowered_state = this->GetWidget<NWidgetCore>(widget_index)->IsLowered();
 488                 this->GetWidget<NWidgetCore>(widget_index)->SetLowered(!lowered_state);
 489         }
 490
 491         /**
 492          * Marks a widget as lowered.
 493          * @param widget_index index of this widget in the window
 494          */
 495         inline void LowerWidget(byte widget_index)
 496         {
 497                 SetWidgetLoweredState(widget_index, true);
 498         }
 499
 500         /**
 501          * Marks a widget as raised.
 502          * @param widget_index index of this widget in the window
 503          */
 504         inline void RaiseWidget(byte widget_index)
 505         {
 506                 SetWidgetLoweredState(widget_index, false);
 507         }
 508
 509         /**
 510          * Gets the lowered state of a widget.
 511          * @param widget_index index of this widget in the window
 512          * @return status of the widget ie: lowered = true, raised= false
 513          */
 514         inline bool IsWidgetLowered(byte widget_index) const
 515         {
 516                 assert(widget_index < this->nested_array_size);
 517                 return this->GetWidget<NWidgetCore>(widget_index)->IsLowered();
 518         }
 519
 520         void UnfocusFocusedWidget();
 521         bool SetFocusedWidget(int widget_index);
 522
 523         EventState HandleEditBoxKey(int wid, WChar key, uint16 keycode);
 524         virtual void InsertTextString(int wid, const char *str, bool marked, const char *caret, const char *insert_location, const char *replacement_end);
 525
 526         void HandleButtonClick(byte widget);
 527         int GetRowFromWidget(int clickpos, int widget, int padding, int line_height = -1) const;
 528
 529         void RaiseButtons(bool autoraise = false);
 530         void CDECL SetWidgetsDisabledState(bool disab_stat, int widgets, ...);
 531         void CDECL SetWidgetsLoweredState(bool lowered_stat, int widgets, ...);
 532         void SetWidgetDirty(byte widget_index) const;
 533
 534         void DrawWidgets() const;
 535         void DrawViewport() const;
 536         void DrawSortButtonState(int widget, SortButtonState state) const;
 537         static int SortButtonWidth();
 538
 539         void DeleteChildWindows(WindowClass wc = WC_INVALID) const;
 540
 541         void SetDirty() const;
 542         void ReInit(int rx = 0, int ry = 0);
 543
 544         /** Is window shaded currently? */
 545         inline bool IsShaded() const
 546         {
 547                 return this->shade_select != nullptr && this->shade_select->shown_plane == SZSP_HORIZONTAL;
 548         }
 549
 550         void SetShaded(bool make_shaded);
 551
 552         void InvalidateData(int data = 0, bool gui_scope = true);
 553         void ProcessScheduledInvalidations();
 554         void ProcessHighlightedInvalidations();
 555
 556         /*** Event handling ***/
 557
 558         /**
 559          * Notification that the nested widget tree gets initialized. The event can be used to perform general computations.
 560          * @note #nested_root and/or #nested_array (normally accessed via #GetWidget()) may not exist during this call.
 561          */
 562         virtual void OnInit() { }
 563
 564         virtual void ApplyDefaults();
 565
 566         /**
 567          * Compute the initial position of the window.
 568          * @param sm_width      Smallest width of the window.
 569          * @param sm_height     Smallest height of the window.
 570          * @param window_number The window number of the new window.
 571          * @return Initial position of the top-left corner of the window.
 572          */
 573         virtual Point OnInitialPosition(int16 sm_width, int16 sm_height, int window_number);
 574
 575         /**
 576          * The window must be repainted.
 577          * @note This method should not change any state, it should only use drawing functions.
 578          */
 579         virtual void OnPaint()
 580         {
 581                 this->DrawWidgets();
 582         }
 583
 584         /**
 585          * Draw the contents of a nested widget.
 586          * @param r      Rectangle occupied by the widget.
 587          * @param widget Number of the widget to draw.
 588          * @note This method may not change any state, it may only use drawing functions.
 589          */
 590         virtual void DrawWidget(const Rect &r, int widget) const {}
 591
 592         /**
 593          * Update size and resize step of a widget in the window.
 594          * After retrieval of the minimal size and the resize-steps of a widget, this function is called to allow further refinement,
 595          * typically by computing the real maximal size of the content. Afterwards, \a size is taken to be the minimal size of the widget
 596          * and \a resize is taken to contain the resize steps. For the convenience of the callee, \a padding contains the amount of
 597          * padding between the content and the edge of the widget. This should be added to the returned size.
 598          * @param widget  Widget number.
 599          * @param size    Size of the widget.
 600          * @param padding Recommended amount of space between the widget content and the widget edge.
 601          * @param fill    Fill step of the widget.
 602          * @param resize  Resize step of the widget.
 603          */
 604         virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) {}
 605
 606         /**
 607          * Initialize string parameters for a widget.
 608          * Calls to this function are made during initialization to measure the size (that is as part of #InitNested()), during drawing,
 609          * and while re-initializing the window. Only for widgets that render text initializing is requested.
 610          * @param widget  Widget number.
 611          */
 612         virtual void SetStringParameters(int widget) const {}
 613
 614         /**
 615          * Called when window gains focus
 616          * @param previously_focused_window The window that lost the focus.
 617          */
 618         virtual void OnFocus(Window *previously_focused_window) {}
 619
 620         virtual void OnFocusLost(Window *newly_focused_window);
 621
 622         /**
 623          * A key has been pressed.
 624          * @param key     the Unicode value of the key.
 625          * @param keycode the untranslated key code including shift state.
 626          * @return #ES_HANDLED if the key press has been handled and no other
 627          *         window should receive the event.
 628          */
 629         virtual EventState OnKeyPress(WChar key, uint16 keycode) { return ES_NOT_HANDLED; }
 630
 631         virtual EventState OnHotkey(int hotkey);
 632
 633         /**
 634          * The state of the control key has changed
 635          * @return #ES_HANDLED if the change has been handled and no other
 636          *         window should receive the event.
 637          */
 638         virtual EventState OnCTRLStateChange() { return ES_NOT_HANDLED; }
 639
 640
 641         /**
 642          * A click with the left mouse button has been made on the window.
 643          * @param pt     the point inside the window that has been clicked.
 644          * @param widget the clicked widget.
 645          * @param click_count Number of fast consecutive clicks at same position
 646          */
 647         virtual void OnClick(Point pt, int widget, int click_count) {}
 648
 649         /**
 650          * A click with the right mouse button has been made on the window.
 651          * @param pt     the point inside the window that has been clicked.
 652          * @param widget the clicked widget.
 653          * @return true if the click was actually handled, i.e. do not show a
 654          *         tooltip if tooltip-on-right-click is enabled.
 655          */
 656         virtual bool OnRightClick(Point pt, int widget) { return false; }
 657
 658         /**
 659         * The mouse is hovering over a widget in the window, perform an action for it, like opening a custom tooltip.
 660         * @param pt     The point where the mouse is hovering.
 661         * @param widget The widget where the mouse is hovering.
 662         */
 663         //virtual void OnHover(Point pt, int widget) {}
 664
 665         /**
 666          * An 'object' is being dragged at the provided position, highlight the target if possible.
 667          * @param pt     The point inside the window that the mouse hovers over.
 668          * @param widget The widget the mouse hovers over.
 669          */
 670         virtual void OnMouseDrag(Point pt, int widget) {}
 671
 672         /**
 673          * A dragged 'object' has been released.
 674          * @param pt     the point inside the window where the release took place.
 675          * @param widget the widget where the release took place.
 676          */
 677         virtual void OnDragDrop(Point pt, int widget) {}
 678
 679         /**
 680          * Handle the request for (viewport) scrolling.
 681          * @param delta the amount the viewport must be scrolled.
 682          */
 683         virtual void OnScroll(Point delta) {}
 684
 685         /**
 686          * The mouse is currently moving over the window or has just moved outside
 687          * of the window. In the latter case pt is (-1, -1).
 688          * @param pt     the point inside the window that the mouse hovers over.
 689          * @param widget the widget the mouse hovers over.
 690          */
 691         virtual void OnMouseOver(Point pt, int widget) {}
 692
 693         /**
 694          * The mouse wheel has been turned.
 695          * @param wheel the amount of movement of the mouse wheel.
 696          */
 697         virtual void OnMouseWheel(int wheel) {}
 698
 699
 700         /**
 701          * Called for every mouse loop run, which is at least once per (game) tick.
 702          */
 703         virtual void OnMouseLoop() {}
 704
 705         /**
 706          * Called once per (game) tick.
 707          */
 708         virtual void OnTick() {}
 709
 710         /**
 711          * Called once every 100 (game) ticks.
 712          */
 713         virtual void OnHundredthTick() {}
 714
 715         /**
 716          * Called when this window's timeout has been reached.
 717          */
 718         virtual void OnTimeout() {}
 719
 720
 721         /**
 722          * Called after the window got resized.
 723          * For nested windows with a viewport, call NWidgetViewport::UpdateViewportCoordinates.
 724          */
 725         virtual void OnResize() {}
 726
 727         /**
 728          * A dropdown option associated to this window has been selected.
 729          * @param widget the widget (button) that the dropdown is associated with.
 730          * @param index  the element in the dropdown that is selected.
 731          */
 732         virtual void OnDropdownSelect(int widget, int index) {}
 733
 734         virtual void OnDropdownClose(Point pt, int widget, int index, bool instant_close);
 735
 736         /**
 737          * A tooltip is about to be shown (e.g. the mouse is hovering). Perform
 738          * an action for it, default is to show the tip of the widget.
 739          *
 740          * @param pt         The point where the mouse is hovering.
 741          * @param widget     The widget where the mouse is hovering.
 742          * @param close_cond How to close tooltips, depands on the way the event was initiated.
 743          *
 744          * @see GuiShowTooltips
 745          */
 746         virtual void OnToolTip(Point pt, int widget, TooltipCloseCondition close_cond)
 747         {
 748                 NWidgetCore *wid = this->GetWidget<NWidgetCore>(widget);
 749                 if (wid != nullptr) GuiShowTooltips(this, wid->tool_tip, close_cond);
 750         }
 751
 752         /**
 753          * The text in an editbox has been edited.
 754          * @param widget The widget of the editbox.
 755          */
 756         virtual void OnEditboxChanged(int widget) {}
 757
 758         /**
 759          * The query window opened from this window has closed.
 760          * @param str the new value of the string, nullptr if the window
 761          *            was cancelled or an empty string when the default
 762          *            button was pressed, i.e. StrEmpty(str).
 763          */
 764         virtual void OnQueryTextFinished(char *str) {}
 765
 766         /**
 767          * Some data on this window has become invalid.
 768          * @param data information about the changed data.
 769          * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
 770          */
 771         virtual void OnInvalidateData(int data = 0, bool gui_scope = true) {}
 772
 773         /**
 774          * The user clicked some place on the map when a tile highlight mode
 775          * has been set.
 776          * @param pt   the exact point on the map that has been clicked.
 777          * @param tile the tile on the map that has been clicked.
 778          */
 779         virtual void OnPlaceObject(Point pt, TileIndex tile) {}
 780
 781         /**
 782          * The user clicked on a vehicle while HT_VEHICLE has been set.
 783          * @param v clicked vehicle. It is guaranteed to be v->IsPrimaryVehicle() == true
 784          * @return True if the click is handled, false if it is ignored.
 785          */
 786         virtual bool OnVehicleSelect(const struct Vehicle *v) { return false; }
 787
 788         /**
 789          * The user cancelled a tile highlight mode that has been set.
 790          */
 791         virtual void OnPlaceObjectAbort() {}
 792
 793
 794         /**
 795          * The user is dragging over the map when the tile highlight mode
 796          * has been set.
 797          * @param select_method the method of selection (allowed directions)
 798          * @param select_proc   what will be created when the drag is over.
 799          * @param pt            the exact point on the map where the mouse is.
 800          */
 801         virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt) {}
 802
 803         /**
 804          * The user has dragged over the map when the tile highlight mode
 805          * has been set.
 806          * @param select_method the method of selection (allowed directions)
 807          * @param select_proc   what should be created.
 808          * @param pt            the exact point on the map where the mouse was released.
 809          * @param start_tile    the begin tile of the drag.
 810          * @param end_tile      the end tile of the drag.
 811          */
 812         virtual void OnPlaceMouseUp(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt, TileIndex start_tile, TileIndex end_tile) {}
 813
 814         /**
 815          * The user moves over the map when a tile highlight mode has been set
 816          * when the special mouse mode has been set to 'PRESIZE' mode. An
 817          * example of this is the tile highlight for dock building.
 818          * @param pt   the exact point on the map where the mouse is.
 819          * @param tile the tile on the map where the mouse is.
 820          */
 821         virtual void OnPlacePresize(Point pt, TileIndex tile) {}
 822
 823         /*** End of the event handling ***/
 824
 825         /**
 826          * Is the data related to this window NewGRF inspectable?
 827          * @return true iff it is inspectable.
 828          */
 829         virtual bool IsNewGRFInspectable() const { return false; }
 830
 831         /**
 832          * Show the NewGRF inspection window. When this function is called it is
 833          * up to the window to call and pass the right parameters to the
 834          * ShowInspectWindow function.
 835          * @pre this->IsNewGRFInspectable()
 836          */
 837         virtual void ShowNewGRFInspectWindow() const { NOT_REACHED(); }
 838 };
 839
 840 /**
 841  * Get the nested widget with number \a widnum from the nested widget tree.
 842  * @tparam NWID Type of the nested widget.
 843  * @param widnum Widget number of the widget to retrieve.
 844  * @return The requested widget if it is instantiated, \c nullptr otherwise.
 845  */
 846 template <class NWID>
 847 inline NWID *Window::GetWidget(uint widnum)
 848 {
 849         if (widnum >= this->nested_array_size || this->nested_array[widnum] == nullptr) return nullptr;
 850         NWID *nwid = dynamic_cast<NWID *>(this->nested_array[widnum]);
 851         assert(nwid != nullptr);
 852         return nwid;
 853 }
 854
 855 /** Specialized case of #Window::GetWidget for the nested widget base class. */
 856 template <>
 857 inline const NWidgetBase *Window::GetWidget<NWidgetBase>(uint widnum) const
 858 {
 859         if (widnum >= this->nested_array_size) return nullptr;
 860         return this->nested_array[widnum];
 861 }
 862
 863 /**
 864  * Get the nested widget with number \a widnum from the nested widget tree.
 865  * @tparam NWID Type of the nested widget.
 866  * @param widnum Widget number of the widget to retrieve.
 867  * @return The requested widget if it is instantiated, \c nullptr otherwise.
 868  */
 869 template <class NWID>
 870 inline const NWID *Window::GetWidget(uint widnum) const
 871 {
 872         return const_cast<Window *>(this)->GetWidget<NWID>(widnum);
 873 }
 874
 875
 876 /**
 877  * Base class for windows opened from a toolbar.
 878  */
 879 class PickerWindowBase : public Window {
 880
 881 public:
 882         PickerWindowBase(WindowDesc *desc, Window *parent) : Window(desc)
 883         {
 884                 this->parent = parent;
 885         }
 886
 887         virtual ~PickerWindowBase();
 888 };
 889
 890 Window *BringWindowToFrontById(WindowClass cls, WindowNumber number);
 891 Window *FindWindowFromPt(int x, int y);
 892
 893 /**
 894  * Open a new window.
 895  * @tparam Wcls %Window class to use if the window does not exist.
 896  * @param desc The pointer to the WindowDesc to be created
 897  * @param window_number the window number of the new window
 898  * @param return_existing If set, also return the window if it already existed.
 899  * @return %Window pointer of the newly created window, or the existing one if \a return_existing is set, or \c nullptr.
 900  */
 901 template <typename Wcls>
 902 Wcls *AllocateWindowDescFront(WindowDesc *desc, int window_number, bool return_existing = false)
 903 {
 904         Wcls *w = static_cast<Wcls *>(BringWindowToFrontById(desc->cls, window_number));
 905         if (w != nullptr) return return_existing ? w : nullptr;
 906         return new Wcls(desc, window_number);
 907 }
 908
 909 void RelocateAllWindows(int neww, int newh);
 910
 911 void GuiShowStationRatingTooltip(Window *parent, const Station *st, const CargoSpec *cs);
 912
 913 /* widget.cpp */
 914 int GetWidgetFromPos(const Window *w, int x, int y);
 915
 916 /** Iterate over all windows */
 917 #define FOR_ALL_WINDOWS_FROM_BACK_FROM(w, start)  for (w = start; w != nullptr; w = w->z_front) if (w->window_class != WC_INVALID)
 918 #define FOR_ALL_WINDOWS_FROM_FRONT_FROM(w, start) for (w = start; w != nullptr; w = w->z_back) if (w->window_class != WC_INVALID)
 919 #define FOR_ALL_WINDOWS_FROM_BACK(w)  FOR_ALL_WINDOWS_FROM_BACK_FROM(w, _z_back_window)
 920 #define FOR_ALL_WINDOWS_FROM_FRONT(w) FOR_ALL_WINDOWS_FROM_FRONT_FROM(w, _z_front_window)
 921
 922 extern Point _cursorpos_drag_start;
 923
 924 extern int _scrollbar_start_pos;
 925 extern int _scrollbar_size;
 926 extern byte _scroller_click_timeout;
 927
 928 extern Window *_scrolling_viewport;
 929 extern bool _mouse_hovering;
 930
 931 /** Mouse modes. */
 932 enum SpecialMouseMode {
 933         WSM_NONE,     ///< No special mouse mode.
 934         WSM_DRAGDROP, ///< Dragging an object.
 935         WSM_SIZING,   ///< Sizing mode.
 936         WSM_PRESIZE,  ///< Presizing mode (docks, tunnels).
 937 };
 938 extern SpecialMouseMode _special_mouse_mode;
 939
 940 void SetFocusedWindow(Window *w);
 941
 942 void ScrollbarClickHandler(Window *w, NWidgetCore *nw, int x, int y);
 943
 944 #endif /* WINDOW_GUI_H */