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// scribblewindow.cs - Qt# scribblewindow
//
// Author: Adam Treat <manyoso@yahoo.com>
// (c) 2002 Adam Treat
// Licensed under the terms of the GNU GPL
namespace QtSamples {
using Qt;
using System;
[DeclareQtSignal ("colorChanged(QColor)")]
[DeclareQtSignal ("load(QString)")]
[DeclareQtSignal ("save(QString)")]
public class ScribbleWindow : QMainWindow {
private QMenuBar menubar;
private QPopupMenu filemenu;
private QPopupMenu aboutmenu;
private QScrollView scrollview;
public ScribbleArea scribblearea;
enum Color {Black, Red, Blue, Green, Yellow};
public static int Main (String[] args)
{
QApplication app = new QApplication (args);
ScribbleWindow demo = new ScribbleWindow ();
demo.SetGeometry (50, 500, 400, 400);
app.SetMainWidget (demo);
demo.SetCaption ("Qt# 0.7!");
demo.Show ();
return app.Exec ();
}
ScribbleWindow () : base (null, null)
{
filemenu = new QPopupMenu (null, "filemenu");
filemenu.InsertItem ("&Load", this, SLOT ("SlotLoad()") );
filemenu.InsertItem ("&Save", this, SLOT ("SlotSave()") );
filemenu.InsertSeparator ();
filemenu.InsertItem ("&Quit", qApp, SLOT ("quit()"));
aboutmenu = new QPopupMenu (null, "helpmenu");
aboutmenu.InsertItem ("&About Qt-Sharp", this, SLOT ("SlotAboutQtSharp()"));
aboutmenu.InsertItem ("&About Qt", this, SLOT ("SlotAboutQt()"));
menubar = new QMenuBar (this, "");
menubar.InsertItem ("&File", filemenu);
menubar.InsertItem ("&Color", this, SLOT("SlotColorChooser()"));
menubar.InsertItem ("&About", aboutmenu);
scrollview = new QScrollView (this);
scrollview.SetGeometry (0, menubar.Height (), Width (), Height () - menubar.Height ());
scribblearea = new ScribbleArea (this);
scribblearea.SetGeometry (0, 0, 1000, 1000);
scrollview.AddChild (scribblearea);
this.SetCentralWidget (scrollview);
SetMaximumSize (Width (), Height () - menubar.Height ());
QObject.Connect (this, SIGNAL ("colorChanged(QColor)"),
scribblearea, SLOT ("SlotSetColor(QColor)") );
QObject.Connect (this, SIGNAL ("load(QString)"),
scribblearea, SLOT ("PerformLoad(QString)") );
QObject.Connect (this, SIGNAL ("save(QString)"),
scribblearea, SLOT ("PerformSave(QString)") );
}
public void SlotLoad ()
{
string filename = QFileDialog.GetOpenFileName (".", "*.bmp", this,
null, "Load File", QString.Null, true);
if ( filename != null )
Emit ("load(QString)", (QString) filename);
}
public void SlotSave ()
{
string filename = QFileDialog.GetSaveFileName (".", "*.bmp", this,
null, "Save File", QString.Null, true);
if ( filename != null )
{
if ( ! filename.ToLower().EndsWith(".bmp") )
filename += ".bmp";
Emit ("save(QString)", (QString) filename);
}
}
public void SlotAboutQtSharp ()
{
QMessageBox.Information (this, "About Qt# 0.7",
"A Qt (http://www.trolltech.com) to C# language binding. \n" +
"Qt# is compatible with Mono (http://go-mono.org) and\n" +
"Portable.NET (http://www.southern-storm.com.au/portable_net.html)\n" +
"(c) 2002 Adam Treat. Licensed under the terms of the GNU GPL.\n"
);
}
public void SlotAboutQt ()
{
QMessageBox.AboutQt (this, "About Qt");
}
public void SlotColorChooser ()
{
QColor chosenColor = QColorDialog.GetColor();
if (chosenColor.IsValid())
Emit ("colorChanged(QColor)", chosenColor);
}
public class ScribbleArea : QFrame {
private QPoint last;
private QPixmap buffer;
private QColor currentcolor = new QColor("Black");
private QPopupMenu popupmenu;
public ScribbleArea (QWidget parent) : base (parent)
{
buffer = new QPixmap ();
last = new QPoint ();
SetBackgroundMode (Qt.BackgroundMode.NoBackground);
popupmenu = new QPopupMenu();
popupmenu.InsertItem ("&Clear", this, SLOT ("SlotClearArea()") );
mouseMoveEvent += new MouseMoveEvent (MouseMoved);
mousePressEvent += new MousePressEvent (MousePressed);
paintEvent += new PaintEvent (PerformPaint);
resizeEvent += new ResizeEvent (PerformResize);
}
public void PerformLoad (QString filename)
{
if ( ! buffer.Load(filename) )
QMessageBox.Warning (null, "Load error", "Could not load file");
Repaint();
}
public void PerformSave (QString filename)
{
if ( ! buffer.Save (filename, "BMP") )
QMessageBox.Warning( null, "Save error", "Could not save file");
}
public void SlotClearArea ()
{
buffer.Fill( new QColor ("white") );
BitBlt (this, 0, 0, buffer, 0, 0, -1, -1, Qt.RasterOp.CopyROP, false);
}
public void SlotSetColor (QColor color)
{
currentcolor = color;
}
// Note, Dispose() is called on QPoints here to increase performance
// of the UI. Otherwise, the GC would let dead QPoint instances pile
// up and delete them all at once, causing the UI to pause while it frees
// memory. (This happens because the GC runs in the same thread as the
// application.)
protected void MousePressed (QMouseEvent e)
{
if (e.Button() == ButtonState.RightButton )
popupmenu.Exec (QCursor.Pos ());
else {
last.Dispose ();
last = e.Pos();
}
}
protected void MouseMoved (QMouseEvent e)
{
QPainter windowPainter = new QPainter ();
QPainter bufferPainter = new QPainter ();
windowPainter.Begin (this);
bufferPainter.Begin (buffer);
windowPainter.SetPen (currentcolor);
bufferPainter.SetPen (currentcolor);
windowPainter.DrawLine (last, e.Pos());
bufferPainter.DrawLine (last, e.Pos());
windowPainter.End ();
bufferPainter.End ();
last.Dispose ();
last = e.Pos ();
}
protected void PerformPaint (QPaintEvent e)
{
BitBlt(this, 0, 0, buffer,
0, 0, -1, -1, RasterOp.CopyROP, false);
}
protected void PerformResize (QResizeEvent e)
{
QPixmap save = new QPixmap (buffer);
buffer.Resize (e.Size());
buffer.Fill (new QColor("white"));
BitBlt (buffer, 0, 0, save,
0, 0, -1, -1, RasterOp.CopyROP, false);
}
}
}
}
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