src/colorpicker.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2003 by S�astien Laot                                 *
   3  *   slaout@linux62.org                                                    *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 #include "colorpicker.h"
  22 #include "qtimer.h"
  23 #include <kcolordialog.h>
  24
  25 /// ///
  26
  27 /** DektopColorPicker */
  28
  29 /* From Qt documentation:
  30  * " Note that only visible widgets can grab mouse input.
  31  *   If isVisible() returns FALSE for a widget, that widget cannot call grabMouse(). "
  32  * So, we should use an always visible widget to be able to pick a color from screen,
  33  * even by first hidding the main window (user seldomly want to grab a color from BasKet!)
  34  * or use a global shortcut (main window can be hidden when hitting that shortcut).
  35  */
  36
  37 DesktopColorPicker::DesktopColorPicker()
  38  : QDesktopWidget()
  39 {
  40         setName("DesktopColorPicker");
  41         m_gettingColorFromScreen = false;
  42 }
  43
  44 DesktopColorPicker::~DesktopColorPicker()
  45 {
  46 }
  47
  48 void DesktopColorPicker::pickColor()
  49 {
  50         m_gettingColorFromScreen = true;
  51 //      Global::mainContainer->setActive(false);
  52         QTimer::singleShot( 50, this, SLOT(slotDelayedPick()) );
  53 }
  54
  55 /* When firered from basket context menu, and not from menu, grabMouse doesn't work!
  56  * It's perhapse because context menu call slotColorFromScreen() and then
  57  * ungrab the mouse (since menus grab the mouse).
  58  * But why isn't there such bug with normal menus?...
  59  * By calling this method with a QTimer::singleShot, we are sure context menu code is
  60  * finished and we can grab the mouse without loosing the grab:
  61  */
  62 void DesktopColorPicker::slotDelayedPick()
  63 {
  64         grabKeyboard();
  65         grabMouse(crossCursor);
  66 }
  67
  68 /* Validate the color
  69  */
  70 void DesktopColorPicker::mouseReleaseEvent(QMouseEvent *event)
  71 {
  72         if (m_gettingColorFromScreen) {
  73                 m_gettingColorFromScreen = false;
  74                 releaseMouse();
  75                 releaseKeyboard();
  76                 QColor color = KColorDialog::grabColor(event->globalPos());
  77                 emit pickedColor(color);
  78         } else
  79                 QDesktopWidget::mouseReleaseEvent(event);
  80 }
  81
  82 /* Cancel the mode
  83  */
  84 void DesktopColorPicker::keyPressEvent(QKeyEvent *event)
  85 {
  86         if (m_gettingColorFromScreen)
  87                 if (event->key() == Qt::Key_Escape) {
  88                         m_gettingColorFromScreen = false;
  89                         releaseMouse();
  90                         releaseKeyboard();
  91                         emit canceledPick();
  92                 }
  93         QDesktopWidget::keyPressEvent(event);
  94 }
  95
  96 #include "colorpicker.moc"