kolourpaint/commands/kpCommandHistory.cpp

   1
   2 /*
   3    Copyright (c) 2003-2007 Clarence Dang <dang@kde.org>
   4    All rights reserved.
   5
   6    Redistribution and use in source and binary forms, with or without
   7    modification, are permitted provided that the following conditions
   8    are met:
   9
  10    1. Redistributions of source code must retain the above copyright
  11       notice, this list of conditions and the following disclaimer.
  12    2. Redistributions in binary form must reproduce the above copyright
  13       notice, this list of conditions and the following disclaimer in the
  14       documentation and/or other materials provided with the distribution.
  15
  16    THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 */
  27
  28
  29 #define DEBUG_KP_COMMAND_HISTORY 0
  30
  31
  32 #include <kpCommandHistory.h>
  33
  34 #include <kpAbstractSelection.h>
  35 #include <kpMainWindow.h>
  36 #include <kpTool.h>
  37 #include <kpToolSelectionCreateCommand.h>
  38
  39
  40 kpCommandHistory::kpCommandHistory (bool doReadConfig, kpMainWindow *mainWindow)
  41     : kpCommandHistoryBase (doReadConfig, mainWindow->actionCollection ()),
  42       m_mainWindow (mainWindow)
  43 {
  44 }
  45
  46 kpCommandHistory::~kpCommandHistory ()
  47 {
  48 }
  49
  50
  51 static bool NextUndoCommandIsCreateBorder (kpCommandHistory *commandHistory)
  52 {
  53     Q_ASSERT (commandHistory);
  54
  55     kpCommand *cmd = commandHistory->nextUndoCommand ();
  56     if (!cmd)
  57         return false;
  58
  59     kpToolSelectionCreateCommand *c = dynamic_cast <kpToolSelectionCreateCommand *> (cmd);
  60     if (!c)
  61         return false;
  62
  63     const kpAbstractSelection *sel = c->fromSelection ();
  64     Q_ASSERT (sel);
  65
  66     return (!sel->hasContent ());
  67 }
  68
  69 // public
  70 void kpCommandHistory::addCreateSelectionCommand (kpToolSelectionCreateCommand *cmd,
  71         bool execute)
  72 {
  73     if (cmd->fromSelection ()->hasContent ())
  74     {
  75         addCommand (cmd, execute);
  76         return;
  77     }
  78
  79     if (::NextUndoCommandIsCreateBorder (this))
  80     {
  81         setNextUndoCommand (cmd);
  82         if (execute)
  83             cmd->execute ();
  84     }
  85     else
  86         addCommand (cmd, execute);
  87 }
  88
  89
  90 // public slot virtual [base KCommandHistory]
  91 void kpCommandHistory::undo ()
  92 {
  93 #if DEBUG_KP_COMMAND_HISTORY
  94     kDebug () << "kpCommandHistory::undo() CALLED!";
  95 #endif
  96     if (m_mainWindow && m_mainWindow->toolHasBegunShape ())
  97     {
  98     #if DEBUG_KP_COMMAND_HISTORY
  99         kDebug () << "\thas begun shape - cancel draw";
 100     #endif
 101         m_mainWindow->tool ()->cancelShapeInternal ();
 102     }
 103     else
 104         kpCommandHistoryBase::undo ();
 105 }
 106
 107 // public slot virtual [base KCommandHistory]
 108 void kpCommandHistory::redo ()
 109 {
 110     if (m_mainWindow && m_mainWindow->toolHasBegunShape ())
 111     {
 112         // Not completely obvious but what else can we do?
 113         //
 114         // Ignoring the request would not be intuitive for tools like
 115         // Polygon & Polyline (where it's not always apparent to the user
 116         // that s/he's still drawing a shape even though the mouse isn't
 117         // down).
 118         m_mainWindow->tool ()->cancelShapeInternal ();
 119     }
 120     else
 121         kpCommandHistoryBase::redo ();
 122 }
 123
 124
 125 #include <kpCommandHistory.moc>