include/vcl/ctrl.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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   9  * This file incorporates work covered by the following license notice:
  10  *
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_VCL_CTRL_HXX
  21 #define INCLUDED_VCL_CTRL_HXX
  22
  23 #include <tools/link.hxx>
  24 #include <tools/solar.h>
  25 #include <vcl/dllapi.h>
  26 #include <vcl/window.hxx>
  27 #include <vcl/salnativewidgets.hxx>
  28
  29 // forward
  30 namespace vcl { struct ImplControlData; struct ControlLayoutData; }
  31 class StyleSettings;
  32
  33
  34 class VCL_DLLPUBLIC Control : public vcl::Window
  35 {
  36 protected:
  37     vcl::ImplControlData* mpControlData;
  38
  39 private:
  40     bool                    mbHasControlFocus;
  41     bool                    mbShowAccelerator;
  42     Link<Control&,void>     maGetFocusHdl;
  43     Link<Control&,void>     maLoseFocusHdl;
  44
  45     SAL_DLLPRIVATE void     ImplInitControlData();
  46
  47                             Control (const Control &) = delete;
  48                             Control & operator= (const Control &) = delete;
  49
  50 protected:
  51                     Control( WindowType nType );
  52     virtual void    FillLayoutData() const;
  53
  54     // helper method for composite controls
  55     void            AppendLayoutData( const Control& rSubControl ) const;
  56
  57     /// creates the mpData->mpLayoutData structure
  58     void            CreateLayoutData() const;
  59     /// determines whether we currently have layout data
  60     bool            HasLayoutData() const;
  61
  62     /** this calls both our event listeners, and a specified handler
  63
  64         If the Control instance is destroyed during any of those calls, the
  65         method properly handles this (in particular, it doesn't crash :)
  66
  67         @param nEvent
  68             the event to notify to our event listeners
  69         @param callHandler
  70             the lambda function that calls the handler
  71         @return
  72             if the Control instance has been destroyed in any of the call
  73     */
  74     bool        ImplCallEventListenersAndHandler(
  75                     VclEventId nEvent, std::function<void()> const & callHandler
  76                 );
  77
  78     /** draws the given text onto the given device
  79
  80         If no reference device is set, the draw request will simply be forwarded to OutputDevice::DrawText. Otherwise,
  81         the text will be rendered according to the metrics at the reference device.
  82
  83         return will contain the result of a GetTextRect call (either directly
  84         at the target device, or taking the reference device into account) when
  85         returning.
  86     */
  87     tools::Rectangle DrawControlText( OutputDevice& _rTargetDevice, const tools::Rectangle& _rRect,
  88                                const OUString& _rStr, DrawTextFlags _nStyle,
  89                                MetricVector* _pVector, OUString* _pDisplayText,
  90                                const Size* i_pDeviceSize = nullptr ) const;
  91
  92     tools::Rectangle GetControlTextRect( OutputDevice& _rTargetDevice, const tools::Rectangle & rRect,
  93                                   const OUString& _rStr, DrawTextFlags _nStyle,
  94                                   Size* o_pDeviceSize = nullptr ) const;
  95
  96     virtual const vcl::Font&
  97                 GetCanonicalFont( const StyleSettings& _rStyle ) const;
  98     virtual const Color&
  99                 GetCanonicalTextColor( const StyleSettings& _rStyle ) const;
 100
 101     void ImplInitSettings();
 102
 103     virtual void ApplySettings(vcl::RenderContext& rRenderContext) override;
 104
 105 public:
 106     SAL_DLLPRIVATE void ImplClearLayoutData() const;
 107     /** draws a frame around the give rectangle, onto the given device
 108
 109         only to be used from within the Window::Draw method of your sub class.
 110
 111         The frame is always drawn with a single line (without 3D effects). In addition, any mono
 112         color set at the control's settings is respected. Yet more additionally, if we're living
 113         in a themed desktop, this theming is ignored.
 114
 115         Note that this makes sense, since the *only known* clients of Window::Draw
 116         are form controls, when printed or print-previewed. For form controls embedded in office documents,
 117         you don't want to have the theme look.
 118
 119         @param pDev
 120             the device to draw onto
 121         @param rRect
 122             the rect for drawing the frame. Upon returning from the call, the rect will be inflated
 123             by the space occupied by the drawn pixels.
 124     */
 125     SAL_DLLPRIVATE void ImplDrawFrame( OutputDevice* pDev, tools::Rectangle& rRect );
 126
 127 public:
 128     explicit        Control( vcl::Window* pParent, WinBits nWinStyle = 0 );
 129     virtual         ~Control() override;
 130     virtual void    dispose() override;
 131
 132     virtual void    EnableRTL ( bool bEnable = true ) override;
 133
 134     virtual bool    EventNotify( NotifyEvent& rNEvt ) override;
 135     virtual void    StateChanged( StateChangedType nStateChange ) override;
 136     virtual void    Resize() override;
 137
 138     // invalidates layout data
 139     virtual void    SetText( const OUString& rStr ) override;
 140     // gets the displayed text
 141     virtual OUString GetDisplayText() const override;
 142     // returns the bounding box for the character at index nIndex (in control coordinates)
 143     tools::Rectangle GetCharacterBounds( long nIndex ) const;
 144     // returns the character index for corresponding to rPoint (in control coordinates)
 145     // -1 is returned if no character is at that point
 146     long GetIndexForPoint( const Point& rPoint ) const;
 147     // returns the interval [start,end] of line nLine
 148     // returns [-1,-1] for an invalid line
 149     Pair GetLineStartEnd( long nLine ) const;
 150     /** ToRelativeLineIndex changes a layout data index to a count relative to its line.
 151
 152     This is equivalent to getting the line start/end pairs with
 153     GetLineStartEnd() until the index lies within [start,end] of a line
 154
 155     @param nIndex
 156     the absolute index inside the display text to be changed to a relative index
 157
 158     @returns
 159     the relative index inside the displayed line or -1 if the absolute index does
 160     not match any line
 161     */
 162     long ToRelativeLineIndex( long nIndex ) const;
 163
 164     void            SetGetFocusHdl( const Link<Control&,void>& rLink ) { maGetFocusHdl = rLink; }
 165     void            SetLoseFocusHdl( const Link<Control&,void>& rLink ) { maLoseFocusHdl = rLink; }
 166     const Link<Control&,void>& GetLoseFocusHdl() const { return maLoseFocusHdl; }
 167
 168     /** determines whether the control currently has the focus
 169     */
 170     bool            HasControlFocus() const { return mbHasControlFocus; }
 171
 172     void            SetLayoutDataParent( const Control* pParent ) const;
 173
 174     virtual Size    GetOptimalSize() const override;
 175
 176     /** sets a reference device used for rendering control text
 177         @see DrawControlText
 178     */
 179     void            SetReferenceDevice( OutputDevice* _referenceDevice );
 180     OutputDevice*   GetReferenceDevice() const;
 181
 182     vcl::Font       GetUnzoomedControlPointFont() const;
 183     void            SetShowAccelerator (bool val);
 184 };
 185
 186 #endif // INCLUDED_VCL_CTRL_HXX
 187
 188 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */