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