Hi:
1) The first and the most importan problem: I'm having problem to make a
draw into a drawable. It uses to much memory. My application get to much
bussy for this operation. The idea is to show a number of lines in a drawing
area with line numbers (It is a file viewer like, so the number of lines is
around 1500 or 100000 and even more).
2) The other problem is that the Rectangle that i Draw in
OnDrawing_ButtonPressed is displayed but at the same time, it is hidden
automatically. Why is that? (If i did a rectangle on expose event it works
great, but i need to do when the user press the mouse button).
The source code:
using System;
using System.Drawing;
using Gtk;
namespace Test
{
public partial class TextViewer : Gtk.Bin
{
protected int MaxWidth;
protected string[] Lines;
public TextViewer(string[] lines)
{
this.Build();
this.da.AddEvents((int)Gdk.EventMask.ButtonPressMask);
this.da.ExposeEvent += new
ExposeEventHandler(this.OnDrawing_Exposed);
this.da.ButtonPressEvent += new
ButtonPressEventHandler(this.OnDrawing_ButtonPressed);
Lines = lines;
this.ShowAll();
}
protected void OnDrawing_Exposed(object sender, ExposeEventArgs
args)
{
int h = this.Lines.Length * 10 + 10;
DrawingArea da = (DrawingArea)sender;
using(Graphics g =
Gtk.DotNet.Graphics.FromDrawable(da.GdkWindow))
{
Font f = new Font("Arial", 10);
using(Brush b = new SolidBrush(Color.Black))
{
for(int i = 0; i < this.Lines.Length; i ++)
{
int pos = 0 + (10 * i);
g.DrawString(i.ToString().PadLeft(8, '0'), f, b, 5, pos);
g.DrawString(this.Lines[i], f, b, 90, pos);
if(this.Lines[i].Trim().Length > this.MaxWidth)
this.MaxWidth =
this.Lines[i].Trim().Length;
}
this.MaxWidth = this.MaxWidth * 2;
using(Pen p = new Pen(b))
g.DrawLine(p, 80, 0,
80, h);
}
}
da.SetSizeRequest(this.MaxWidth, h);
}
protected void OnDrawing_ButtonPressed(object sender,
ButtonPressEventArgs
args)
{
DrawingArea da = (DrawingArea)sender;
int lmin;
int l = Convert.ToInt32(args.Event.Y);
string ls = l.ToString();
if(ls.Length == 1) {
lmin = 0;
}
else {
lmin = Convert.ToInt32(ls.Substring(0,
ls.Length-1) + "0");
}
using(Graphics g =
Gtk.DotNet.Graphics.FromDrawable(da.GdkWindow))
{
Point p = new Point(0, lmin);
Size sz = new Size(this.MaxWidth, 10);
Rectangle r = new Rectangle(p, sz);
Brush b = new SolidBrush(Color.Red);
Pen pe = new Pen(b);
g.DrawRectangle(pe, r);
((IDisposable)b).Dispose();
((IDisposable)pe).Dispose();
}
}
}
}
Thanks a lot
Luciano
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