115 lines
3.8 KiB
C#
115 lines
3.8 KiB
C#
using System.Drawing;
|
|
using System.Windows.Forms;
|
|
|
|
namespace LibreHardwareMonitor.UI.Themes
|
|
{
|
|
public class ThemedVScrollIndicator : Control
|
|
{
|
|
private readonly VScrollBar _scrollbar;
|
|
private int _startValue = 0;
|
|
private int _startPos = 0;
|
|
private bool _isScrolling = false;
|
|
|
|
public static void AddToControl(Control control)
|
|
{
|
|
foreach (Control child in control.Controls)
|
|
{
|
|
if (child is VScrollBar scrollbar)
|
|
{
|
|
control.Controls.Add(new ThemedVScrollIndicator(scrollbar));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
public ThemedVScrollIndicator(VScrollBar scrollBar)
|
|
{
|
|
_scrollbar = scrollBar;
|
|
|
|
Width = 8;
|
|
SetStyle(ControlStyles.ResizeRedraw, true);
|
|
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
|
|
SetStyle(ControlStyles.UserPaint, true);
|
|
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
|
|
Left = scrollBar.Parent.Width - Width;
|
|
Top = 0;
|
|
Size = new Size(Width, scrollBar.Parent.Height);
|
|
Anchor = AnchorStyles.Right | AnchorStyles.Top | AnchorStyles.Bottom;
|
|
Visible = scrollBar.Visible;
|
|
|
|
scrollBar.VisibleChanged += (s, e) => Visible = (s as ScrollBar).Visible;
|
|
scrollBar.Scroll += (s, e) => Invalidate();
|
|
scrollBar.ValueChanged += (s, e) => Invalidate();
|
|
|
|
scrollBar.Width = 0;
|
|
this.MouseDown += OnMouseDown;
|
|
}
|
|
|
|
private void OnMouseDown(object sender, MouseEventArgs e)
|
|
{
|
|
if (_isScrolling)
|
|
return;
|
|
|
|
_isScrolling = true;
|
|
|
|
//note: this.Capture is true when the control is clicked, no need to handle this
|
|
|
|
_startPos = e.Y;
|
|
_startValue = _scrollbar.Value;
|
|
|
|
this.MouseUp += OnMouseUp;
|
|
this.MouseMove += OnMouseMove;
|
|
}
|
|
|
|
private void OnMouseUp(object sender, MouseEventArgs e)
|
|
{
|
|
_isScrolling = false;
|
|
this.MouseUp -= OnMouseUp;
|
|
this.MouseMove -= OnMouseMove;
|
|
}
|
|
|
|
private void OnMouseMove(object sender, MouseEventArgs e)
|
|
{
|
|
if (!_isScrolling)
|
|
return;
|
|
|
|
//pixel to range scaling:
|
|
double totalRange = _scrollbar.Maximum - _scrollbar.Minimum;
|
|
|
|
if (totalRange <= 0)
|
|
return;
|
|
|
|
double scaleToPercent = totalRange / Bounds.Height;
|
|
double scrollValue = _startValue + (e.Y - _startPos) * scaleToPercent;
|
|
|
|
if (scrollValue < _scrollbar.Minimum)
|
|
scrollValue = _scrollbar.Minimum;
|
|
|
|
if (scrollValue > (_scrollbar.Maximum - _scrollbar.LargeChange))
|
|
scrollValue = _scrollbar.Maximum - _scrollbar.LargeChange;
|
|
|
|
_scrollbar.Value = (int)scrollValue;
|
|
Refresh();
|
|
}
|
|
|
|
protected override void OnPaint(PaintEventArgs e)
|
|
{
|
|
Graphics g = e.Graphics;
|
|
|
|
using (SolidBrush brush = new SolidBrush(Theme.Current.ScrollbarBackground))
|
|
g.FillRectangle(brush, new Rectangle(0, 0, Bounds.Width, Bounds.Height));
|
|
|
|
int height = Bounds.Height;
|
|
int range = _scrollbar.Maximum - _scrollbar.Minimum;
|
|
|
|
if (range > 0)
|
|
{
|
|
int start = height * (_scrollbar.Value - _scrollbar.Minimum) / range;
|
|
int end = height * (_scrollbar.Value - _scrollbar.Minimum + _scrollbar.LargeChange) / range;
|
|
using (SolidBrush brush = new SolidBrush(Theme.Current.ScrollbarTrack))
|
|
g.FillRectangle(brush, new Rectangle(2, start, Bounds.Width - 4, end - start));
|
|
}
|
|
}
|
|
}
|
|
}
|