GtkSharp/sample/CustomCellRenderer.cs
Bertrand Lorentz 75f9a8acb7 sample: Update CustomCellRenderer and add it to the build
The progress bar rendered by the CustomCellRenderer might not be visible
because of a bug in the default theme in GNOME 3. Applying the following
patch fixes that :
http://git.gnome.org/browse/gnome-themes-standard/commit/?id=756f2ea3
2011-07-03 13:32:35 +02:00

135 lines
3.2 KiB
C#

// CustomCellRenderer.cs : C# implementation of an example custom cellrenderer
// from http://scentric.net/tutorial/sec-custom-cell-renderers.html
//
// Author: Todd Berman <tberman@sevenl.net>
//
// (c) 2004 Todd Berman
using System;
using Gtk;
using Gdk;
using GLib;
public class CustomCellRenderer : CellRenderer
{
private float percent;
[GLib.Property ("percent")]
public float Percentage
{
get {
return percent;
}
set {
percent = value;
}
}
protected override void OnGetSize (Widget widget, ref Rectangle cell_area, out int x_offset, out int y_offset, out int width, out int height)
{
int calc_width = (int) this.Xpad * 2 + 100;
int calc_height = (int) this.Ypad * 2 + 10;
width = calc_width;
height = calc_height;
x_offset = 0;
y_offset = 0;
if (!cell_area.Equals (Rectangle.Zero)) {
x_offset = (int) (this.Xalign * (cell_area.Width - calc_width));
x_offset = Math.Max (x_offset, 0);
y_offset = (int) (this.Yalign * (cell_area.Height - calc_height));
y_offset = Math.Max (y_offset, 0);
}
}
protected override void OnRender (Cairo.Context cr, Widget widget, Rectangle background_area, Rectangle cell_area, CellRendererState flags)
{
int x = (int) (cell_area.X + this.Xpad);
int y = (int) (cell_area.Y + this.Ypad);
int width = (int) (cell_area.Width - this.Xpad * 2);
int height = (int) (cell_area.Height - this.Ypad * 2);
widget.StyleContext.Save ();
widget.StyleContext.AddClass ("trough");
widget.StyleContext.RenderBackground (cr, x, y, width, height);
widget.StyleContext.RenderFrame (cr, x, y, width, height);
Border padding = widget.StyleContext.GetPadding (StateFlags.Normal);
x += padding.Left;
y += padding.Top;
width -= padding.Left + padding.Right;
height -= padding.Top + padding.Bottom;
widget.StyleContext.Restore ();
widget.StyleContext.Save ();
widget.StyleContext.AddClass ("progressbar");
widget.StyleContext.RenderActivity (cr, x, y, (int) (width * Percentage), height);
widget.StyleContext.Restore ();
}
}
public class Driver : Gtk.Window
{
public static void Main ()
{
Gtk.Application.Init ();
new Driver ();
Gtk.Application.Run ();
}
ListStore liststore;
public Driver () : base ("CustomCellRenderer")
{
DefaultSize = new Size (150, 100);
this.DeleteEvent += new DeleteEventHandler (window_delete);
liststore = new ListStore (typeof (float), typeof (string));
liststore.AppendValues (0.5f, "50%");
TreeView view = new TreeView (liststore);
view.AppendColumn ("Progress", new CellRendererText (), "text", 1);
view.AppendColumn ("Progress", new CustomCellRenderer (), "percent", 0);
this.Add (view);
this.ShowAll ();
GLib.Timeout.Add (50, new GLib.TimeoutHandler (update_percent));
}
bool increasing = true;
bool update_percent ()
{
TreeIter iter;
liststore.GetIterFirst (out iter);
float perc = (float) liststore.GetValue (iter, 0);
if ((perc > 0.99) || (perc < 0.01 && perc > 0)) {
increasing = !increasing;
}
if (increasing)
perc += 0.01f;
else
perc -= 0.01f;
liststore.SetValue (iter, 0, perc);
liststore.SetValue (iter, 1, Convert.ToInt32 (perc * 100) + "%");
return true;
}
void window_delete (object obj, DeleteEventArgs args)
{
Gtk.Application.Quit ();
args.RetVal = true;
}
}