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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;
/* MinHeight
* MaxHeight
*
*
*/
namespace QuickRoute.Controls
{
public partial class ScrollableLabel : UserControl
{
private SizeF textSize;
private int minHeight = 16;
private int maxHeight = 32;
private bool scrollbarVisible;
private bool resizingNow;
public ScrollableLabel()
{
InitializeComponent();
}
public override string Text
{
get
{
return base.Text;
}
set
{
base.Text = value;
MeasureText();
DrawText();
}
}
public override bool AutoSize
{
get
{
return base.AutoSize;
}
set
{
base.AutoSize = value;
}
}
public int MinHeight
{
get { return minHeight; }
set { minHeight = value; }
}
public int MaxHeight
{
get { return maxHeight; }
set { maxHeight = value; }
}
private void DrawText()
{
Graphics g = CreateGraphics();
g.Clear(BackColor);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
RectangleF rect = new RectangleF(
(float)Padding.Left,
(float)(Padding.Top - (scrollbarVisible ? scrollbar.Value : 0)),
textSize.Width,
textSize.Height);
Brush b = new SolidBrush(ForeColor);
g.DrawString(Text, Font, b, rect);
b.Dispose();
g.Dispose();
}
private void MeasureText()
{
Graphics g = CreateGraphics();
// measure the string
// without scrollbar
SizeF characterSize = g.MeasureString("A", Font);
SizeF textSizeWithoutScrollbar = g.MeasureString(Text, Font, Width - Padding.Horizontal);
// with scrollbar
SizeF textSizeWithScrollbar = g.MeasureString(Text, Font, Width - Padding.Horizontal - scrollbar.Width);
// do we need to use a scrollbar?
scrollbarVisible = (int)textSizeWithoutScrollbar.Height > maxHeight;
if (scrollbarVisible)
{
textSize = textSizeWithScrollbar;
}
else
{
textSize = textSizeWithoutScrollbar;
}
int proposedHeight = Padding.Vertical + (int)Math.Ceiling(textSize.Height);
proposedHeight = Math.Min(Math.Max(proposedHeight, minHeight), maxHeight);
resizingNow = true;
Height = proposedHeight;
resizingNow = false;
if (scrollbarVisible)
{
scrollbar.Maximum = (int)textSizeWithScrollbar.Height;
scrollbar.LargeChange = maxHeight;
scrollbar.SmallChange = (int)characterSize.Height;
}
g.Dispose();
scrollbar.Visible = scrollbarVisible;
scrollbar.Left = Width - scrollbar.Width;
scrollbar.Height = Height;
}
private void ScrollableLabel_Paint(object sender, PaintEventArgs e)
{
DrawText();
}
private void ScrollableLabel_Resize(object sender, EventArgs e)
{
if (!resizingNow)
{
MeasureText();
DrawText();
}
}
private void scrollbar_Scroll(object sender, ScrollEventArgs e)
{
DrawText();
}
private void scrollbar_ValueChanged(object sender, EventArgs e)
{
DrawText();
}
private void ScrollableLabel_LocationChanged(object sender, EventArgs e)
{
DrawText();
}
}
}
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