chrome/browser/ui/gtk/gtk_window_util.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/gtk/gtk_window_util.h"
   6
   7 #include <dlfcn.h>
   8 #include "content/public/browser/render_view_host.h"
   9 #include "content/public/browser/web_contents.h"
  10 #include "content/public/browser/web_contents_view.h"
  11 #include "ui/base/base_window.h"
  12
  13 using content::RenderWidgetHost;
  14 using content::WebContents;
  15
  16 namespace gtk_window_util {
  17
  18 const int kFrameBorderThickness = 4;
  19 const int kResizeAreaCornerSize = 16;
  20
  21 // Keep track of the last click time and the last click position so we can
  22 // filter out extra GDK_BUTTON_PRESS events when a double click happens.
  23 static guint32 last_click_time;
  24 static int last_click_x;
  25 static int last_click_y;
  26
  27 // Performs Cut/Copy/Paste operation on the |window|.
  28 // If the current render view is focused, then just call the specified |method|
  29 // against the current render view host, otherwise emit the specified |signal|
  30 // against the focused widget.
  31 // TODO(suzhe): This approach does not work for plugins.
  32 void DoCutCopyPaste(GtkWindow* window,
  33                     WebContents* web_contents,
  34                     void (RenderWidgetHost::*method)(),
  35                     const char* signal) {
  36   GtkWidget* widget = gtk_window_get_focus(window);
  37   if (widget == NULL)
  38     return;  // Do nothing if no focused widget.
  39
  40   if (web_contents &&
  41       widget == web_contents->GetView()->GetContentNativeView()) {
  42     (web_contents->GetRenderViewHost()->*method)();
  43   } else {
  44     guint id;
  45     if ((id = g_signal_lookup(signal, G_OBJECT_TYPE(widget))) != 0)
  46       g_signal_emit(widget, id, 0);
  47   }
  48 }
  49
  50 void DoCut(GtkWindow* window, WebContents* web_contents) {
  51   DoCutCopyPaste(window, web_contents,
  52                  &RenderWidgetHost::Cut, "cut-clipboard");
  53 }
  54
  55 void DoCopy(GtkWindow* window, WebContents* web_contents) {
  56   DoCutCopyPaste(window, web_contents,
  57                  &RenderWidgetHost::Copy, "copy-clipboard");
  58 }
  59
  60 void DoPaste(GtkWindow* window, WebContents* web_contents) {
  61   DoCutCopyPaste(window, web_contents,
  62                  &RenderWidgetHost::Paste, "paste-clipboard");
  63 }
  64
  65 // Ubuntu patches their version of GTK+ so that there is always a
  66 // gripper in the bottom right corner of the window. We dynamically
  67 // look up this symbol because it's a non-standard Ubuntu extension to
  68 // GTK+. We always need to disable this feature since we can't
  69 // communicate this to WebKit easily.
  70 typedef void (*gtk_window_set_has_resize_grip_func)(GtkWindow*, gboolean);
  71 gtk_window_set_has_resize_grip_func gtk_window_set_has_resize_grip_sym;
  72
  73 void DisableResizeGrip(GtkWindow* window) {
  74   static bool resize_grip_looked_up = false;
  75   if (!resize_grip_looked_up) {
  76     resize_grip_looked_up = true;
  77     gtk_window_set_has_resize_grip_sym =
  78         reinterpret_cast<gtk_window_set_has_resize_grip_func>(
  79             dlsym(NULL, "gtk_window_set_has_resize_grip"));
  80   }
  81   if (gtk_window_set_has_resize_grip_sym)
  82     gtk_window_set_has_resize_grip_sym(window, FALSE);
  83 }
  84
  85 GdkCursorType GdkWindowEdgeToGdkCursorType(GdkWindowEdge edge) {
  86   switch (edge) {
  87     case GDK_WINDOW_EDGE_NORTH_WEST:
  88       return GDK_TOP_LEFT_CORNER;
  89     case GDK_WINDOW_EDGE_NORTH:
  90       return GDK_TOP_SIDE;
  91     case GDK_WINDOW_EDGE_NORTH_EAST:
  92       return GDK_TOP_RIGHT_CORNER;
  93     case GDK_WINDOW_EDGE_WEST:
  94       return GDK_LEFT_SIDE;
  95     case GDK_WINDOW_EDGE_EAST:
  96       return GDK_RIGHT_SIDE;
  97     case GDK_WINDOW_EDGE_SOUTH_WEST:
  98       return GDK_BOTTOM_LEFT_CORNER;
  99     case GDK_WINDOW_EDGE_SOUTH:
 100       return GDK_BOTTOM_SIDE;
 101     case GDK_WINDOW_EDGE_SOUTH_EAST:
 102       return GDK_BOTTOM_RIGHT_CORNER;
 103     default:
 104       NOTREACHED();
 105   }
 106   return GDK_LAST_CURSOR;
 107 }
 108
 109 bool BoundsMatchMonitorSize(GtkWindow* window, gfx::Rect bounds) {
 110   // A screen can be composed of multiple monitors.
 111   GdkScreen* screen = gtk_window_get_screen(window);
 112   GdkRectangle monitor_size;
 113
 114   if (gtk_widget_get_realized(GTK_WIDGET(window))) {
 115     // |window| has been realized.
 116     gint monitor_num = gdk_screen_get_monitor_at_window(screen,
 117         gtk_widget_get_window(GTK_WIDGET(window)));
 118     gdk_screen_get_monitor_geometry(screen, monitor_num, &monitor_size);
 119     return bounds.size() == gfx::Size(monitor_size.width, monitor_size.height);
 120   }
 121
 122   // Make sure the window doesn't match any monitor size. We compare against
 123   // all monitors because we don't know which monitor the window is going to
 124   // open on before window realized.
 125   gint num_monitors = gdk_screen_get_n_monitors(screen);
 126   for (gint i = 0; i < num_monitors; ++i) {
 127     GdkRectangle monitor_size;
 128     gdk_screen_get_monitor_geometry(screen, i, &monitor_size);
 129     if (bounds.size() == gfx::Size(monitor_size.width, monitor_size.height))
 130       return true;
 131   }
 132   return false;
 133 }
 134
 135 bool HandleTitleBarLeftMousePress(
 136     GtkWindow* window,
 137     const gfx::Rect& bounds,
 138     GdkEventButton* event) {
 139   // We want to start a move when the user single clicks, but not start a
 140   // move when the user double clicks.  However, a double click sends the
 141   // following GDK events: GDK_BUTTON_PRESS, GDK_BUTTON_RELEASE,
 142   // GDK_BUTTON_PRESS, GDK_2BUTTON_PRESS, GDK_BUTTON_RELEASE.  If we
 143   // start a gtk_window_begin_move_drag on the second GDK_BUTTON_PRESS,
 144   // the call to gtk_window_maximize fails.  To work around this, we
 145   // keep track of the last click and if it's going to be a double click,
 146   // we don't call gtk_window_begin_move_drag.
 147   DCHECK(event->type == GDK_BUTTON_PRESS);
 148   DCHECK(event->button == 1);
 149
 150   static GtkSettings* settings = gtk_settings_get_default();
 151   gint double_click_time = 250;
 152   gint double_click_distance = 5;
 153   g_object_get(G_OBJECT(settings),
 154                "gtk-double-click-time", &double_click_time,
 155                "gtk-double-click-distance", &double_click_distance,
 156                NULL);
 157
 158   guint32 click_time = event->time - last_click_time;
 159   int click_move_x = abs(event->x - last_click_x);
 160   int click_move_y = abs(event->y - last_click_y);
 161
 162   last_click_time = event->time;
 163   last_click_x = static_cast<int>(event->x);
 164   last_click_y = static_cast<int>(event->y);
 165
 166   if (click_time > static_cast<guint32>(double_click_time) ||
 167       click_move_x > double_click_distance ||
 168       click_move_y > double_click_distance) {
 169     // Ignore drag requests if the window is the size of the screen.
 170     // We do this to avoid triggering fullscreen mode in metacity
 171     // (without the --no-force-fullscreen flag) and in compiz (with
 172     // Legacy Fullscreen Mode enabled).
 173     if (!BoundsMatchMonitorSize(window, bounds)) {
 174       gtk_window_begin_move_drag(window, event->button,
 175                                  static_cast<gint>(event->x_root),
 176                                  static_cast<gint>(event->y_root),
 177                                  event->time);
 178     }
 179     return TRUE;
 180   }
 181   return FALSE;
 182 }
 183
 184 void UnMaximize(GtkWindow* window,
 185                 const gfx::Rect& bounds,
 186                 const gfx::Rect& restored_bounds) {
 187   gtk_window_unmaximize(window);
 188
 189   // It can happen that you end up with a window whose restore size is the same
 190   // as the size of the screen, so unmaximizing it merely remaximizes it due to
 191   // the same WM feature that SetWindowSize() works around.  We try to detect
 192   // this and resize the window to work around the issue.
 193   if (bounds.size() == restored_bounds.size())
 194     gtk_window_resize(window, bounds.width(), bounds.height() - 1);
 195 }
 196
 197 void SetWindowCustomClass(GtkWindow* window, const std::string& wmclass) {
 198   gtk_window_set_wmclass(window,
 199                          wmclass.c_str(),
 200                          gdk_get_program_class());
 201
 202   // Set WM_WINDOW_ROLE for session management purposes.
 203   // See http://tronche.com/gui/x/icccm/sec-5.html .
 204   gtk_window_set_role(window, wmclass.c_str());
 205 }
 206
 207 void SetWindowSize(GtkWindow* window, const gfx::Size& size) {
 208   gfx::Size new_size = size;
 209   gint current_width = 0;
 210   gint current_height = 0;
 211   gtk_window_get_size(window, &current_width, &current_height);
 212   GdkRectangle size_with_decorations = {0};
 213   GdkWindow* gdk_window = gtk_widget_get_window(GTK_WIDGET(window));
 214   if (gdk_window) {
 215     gdk_window_get_frame_extents(gdk_window,
 216                                  &size_with_decorations);
 217   }
 218
 219   if (current_width == size_with_decorations.width &&
 220       current_height == size_with_decorations.height) {
 221     // Make sure the window doesn't match any monitor size.  We compare against
 222     // all monitors because we don't know which monitor the window is going to
 223     // open on (the WM decides that).
 224     GdkScreen* screen = gtk_window_get_screen(window);
 225     gint num_monitors = gdk_screen_get_n_monitors(screen);
 226     for (gint i = 0; i < num_monitors; ++i) {
 227       GdkRectangle monitor_size;
 228       gdk_screen_get_monitor_geometry(screen, i, &monitor_size);
 229       if (gfx::Size(monitor_size.width, monitor_size.height) == size) {
 230         gtk_window_resize(window, size.width(), size.height() - 1);
 231         return;
 232       }
 233     }
 234   } else {
 235     // gtk_window_resize is the size of the window not including decorations,
 236     // but we are given the |size| including window decorations.
 237     if (size_with_decorations.width > current_width) {
 238       new_size.set_width(size.width() - size_with_decorations.width +
 239           current_width);
 240     }
 241     if (size_with_decorations.height > current_height) {
 242       new_size.set_height(size.height() - size_with_decorations.height +
 243           current_height);
 244     }
 245   }
 246
 247   gtk_window_resize(window, new_size.width(), new_size.height());
 248 }
 249
 250 void UpdateWindowPosition(ui::BaseWindow* window,
 251                           gfx::Rect* bounds,
 252                           gfx::Rect* restored_bounds) {
 253   gint x, y;
 254   gtk_window_get_position(window->GetNativeWindow(), &x, &y);
 255   (*bounds).set_origin(gfx::Point(x, y));
 256   if (!window->IsFullscreen() && !window->IsMaximized())
 257     *restored_bounds = *bounds;
 258 }
 259
 260 bool GetWindowEdge(const gfx::Size& window_size,
 261                    int top_edge_inset,
 262                    int x,
 263                    int y,
 264                    GdkWindowEdge* edge) {
 265   gfx::Rect middle(window_size);
 266   middle.Inset(kFrameBorderThickness,
 267                kFrameBorderThickness - top_edge_inset,
 268                kFrameBorderThickness,
 269                kFrameBorderThickness);
 270   if (middle.Contains(x, y))
 271     return false;
 272
 273   gfx::Rect north(0, 0, window_size.width(),
 274       kResizeAreaCornerSize - top_edge_inset);
 275   gfx::Rect west(0, 0, kResizeAreaCornerSize, window_size.height());
 276   gfx::Rect south(0, window_size.height() - kResizeAreaCornerSize,
 277       window_size.width(), kResizeAreaCornerSize);
 278   gfx::Rect east(window_size.width() - kResizeAreaCornerSize, 0,
 279       kResizeAreaCornerSize, window_size.height());
 280
 281   if (north.Contains(x, y)) {
 282     if (west.Contains(x, y))
 283       *edge = GDK_WINDOW_EDGE_NORTH_WEST;
 284     else if (east.Contains(x, y))
 285       *edge = GDK_WINDOW_EDGE_NORTH_EAST;
 286     else
 287       *edge = GDK_WINDOW_EDGE_NORTH;
 288   } else if (south.Contains(x, y)) {
 289     if (west.Contains(x, y))
 290       *edge = GDK_WINDOW_EDGE_SOUTH_WEST;
 291     else if (east.Contains(x, y))
 292       *edge = GDK_WINDOW_EDGE_SOUTH_EAST;
 293     else
 294       *edge = GDK_WINDOW_EDGE_SOUTH;
 295   } else {
 296     if (west.Contains(x, y))
 297       *edge = GDK_WINDOW_EDGE_WEST;
 298     else if (east.Contains(x, y))
 299       *edge = GDK_WINDOW_EDGE_EAST;
 300     else
 301       return false;  // The cursor must be outside the window.
 302   }
 303   return true;
 304 }
 305
 306 }  // namespace gtk_window_util