using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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namespace DPumpHydr.WinFrmUI.WenSkin.Controls
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{
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[Designer(typeof(ScrollbarControlDesigner))]
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[DefaultEvent("Scroll")]
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public class UCHScrollbar : UserControl
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{
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#region 属性 English:attribute
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/// <summary>
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/// The mo large change
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/// </summary>
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protected int moLargeChange = 10;
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/// <summary>
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/// The mo small change
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/// </summary>
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protected int moSmallChange = 1;
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/// <summary>
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/// The mo minimum
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/// </summary>
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protected int moMinimum = 0;
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/// <summary>
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/// The mo maximum
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/// </summary>
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protected int moMaximum = 100;
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/// <summary>
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/// The mo value
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/// </summary>
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protected int moValue = 0;
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/// <summary>
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/// The n click point
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/// </summary>
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private int nClickPoint;
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/// <summary>
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/// The mo thumb top
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/// </summary>
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protected int moThumbLeft = 0;
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/// <summary>
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/// The mo automatic size
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/// </summary>
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protected bool moAutoSize = false;
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/// <summary>
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/// The mo thumb down
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/// </summary>
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private bool moThumbMouseDown = false;
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/// <summary>
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/// The mo thumb dragging
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/// </summary>
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private bool moThumbMouseDragging = false;
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/// <summary>
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/// Occurs when [scroll].
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/// </summary>
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public new event EventHandler Scroll = null;
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/// <summary>
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/// Occurs when [value changed].
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/// </summary>
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public event EventHandler ValueChanged = null;
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/// <summary>
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/// The BTN height
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/// </summary>
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private int btnWidth = 18;
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/// <summary>
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/// The m int thumb minimum height
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/// </summary>
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private int m_intThumbMinWidth = 15;
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/// <summary>
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/// Gets or sets the height of the BTN.
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/// </summary>
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/// <value>The height of the BTN.</value>
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public int BtnWidth
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{
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get { return btnWidth; }
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set { btnWidth = value; }
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}
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/// <summary>
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/// Gets or sets the large change.
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/// </summary>
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/// <value>The large change.</value>
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[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("自定义"), Description("LargeChange")]
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public int LargeChange
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{
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get { return moLargeChange; }
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set
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{
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moLargeChange = value;
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Invalidate();
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}
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}
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/// <summary>
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/// Gets or sets the small change.
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/// </summary>
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/// <value>The small change.</value>
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[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("自定义"), Description("SmallChange")]
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public int SmallChange
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{
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get { return moSmallChange; }
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set
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{
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moSmallChange = value;
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Invalidate();
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}
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}
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/// <summary>
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/// Gets or sets the minimum.
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/// </summary>
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/// <value>The minimum.</value>
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[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("自定义"), Description("Minimum")]
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public int Minimum
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{
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get { return moMinimum; }
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set
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{
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moMinimum = value;
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Invalidate();
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}
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}
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/// <summary>
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/// Gets or sets the maximum.
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/// </summary>
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/// <value>The maximum.</value>
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[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("自定义"), Description("Maximum")]
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public int Maximum
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{
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get { return moMaximum; }
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set
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{
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moMaximum = value;
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Invalidate();
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}
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}
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/// <summary>
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/// Gets or sets the value.
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/// </summary>
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/// <value>The value.</value>
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[EditorBrowsable(EditorBrowsableState.Always), Browsable(true), DefaultValue(false), Category("自定义"), Description("Value")]
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public int Value
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{
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get { return moValue; }
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set
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{
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moValue = value;
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if (moValue > moMaximum)
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moValue = moMaximum;
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int nTrackWidth = (this.Width - btnWidth * 2);
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float fThumbWidth = nTrackWidth - Maximum;
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//float fThumbWidth = ((float)LargeChange / (float)Maximum) * nTrackWidth;
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int nThumbWidth = (int)fThumbWidth;
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if (nThumbWidth > nTrackWidth)
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{
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nThumbWidth = nTrackWidth;
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fThumbWidth = nTrackWidth;
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}
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if (nThumbWidth < m_intThumbMinWidth)
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{
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nThumbWidth = m_intThumbMinWidth;
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fThumbWidth = m_intThumbMinWidth;
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}
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//figure out value
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int nPixelRange = nTrackWidth - nThumbWidth;
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int nRealRange = (Maximum - Minimum) - LargeChange;
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float fPerc = 0.0f;
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if (nRealRange != 0)
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{
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fPerc = (float)moValue / (float)nRealRange;
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}
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float fLeft = fPerc * nPixelRange;
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moThumbLeft = (int)fLeft;
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Invalidate();
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether [automatic size].
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/// </summary>
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/// <value><c>true</c> if [automatic size]; otherwise, <c>false</c>.</value>
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public override bool AutoSize
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{
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get
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{
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return base.AutoSize;
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}
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set
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{
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base.AutoSize = value;
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if (base.AutoSize)
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{
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this.Width = 15;
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}
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}
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}
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/// <summary>
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/// The thumb color
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/// </summary>
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private Color thumbColor = Color.FromArgb(104, 104, 104);
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/// <summary>
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/// Gets or sets the color of the thumb.
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/// </summary>
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/// <value>The color of the thumb.</value>
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public Color ThumbColor
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{
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get { return thumbColor; }
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set { thumbColor = value; }
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}
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#endregion
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public UCHScrollbar()
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{
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InitializeComponent();
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this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
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this.SetStyle(ControlStyles.DoubleBuffer, true);
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this.SetStyle(ControlStyles.ResizeRedraw, true);
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this.SetStyle(ControlStyles.Selectable, true);
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this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
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this.SetStyle(ControlStyles.UserPaint, true);
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}
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/// <summary>
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/// 圆角角度
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/// </summary>
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/// <value>The coner radius.</value>
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[Description("圆角角度"), Category("自定义")]
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public virtual int ConerRadius { get; set; } = 3;
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/// <summary>
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/// Initializes the component.
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/// </summary>
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private void InitializeComponent()
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{
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this.SuspendLayout();
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this.MinimumSize = new System.Drawing.Size(0, 10);
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this.Name = "UCHScrollbar";
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this.Size = new System.Drawing.Size(150, 18);
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this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.CustomScrollbar_MouseDown);
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this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.CustomScrollbar_MouseMove);
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this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.CustomScrollbar_MouseUp);
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this.ResumeLayout(false);
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}
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#region 鼠标事件 English:Mouse event
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/// <summary>
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/// Handles the MouseDown event of the CustomScrollbar control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
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private void CustomScrollbar_MouseDown(object sender, MouseEventArgs e)
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{
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if (Maximum <= 0)
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{
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return;
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}
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Point ptPoint = this.PointToClient(Cursor.Position);
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int nTrackWidth = (this.Width - btnWidth * 2);
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float fThumbWidth = nTrackWidth - Maximum;
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//float fThumbWidth = ((float)LargeChange / (float)Maximum) * nTrackWidth;
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int nThumbWidth = (int)fThumbWidth;
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if (nThumbWidth > nTrackWidth)
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{
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nThumbWidth = nTrackWidth;
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fThumbWidth = nTrackWidth;
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}
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if (nThumbWidth < m_intThumbMinWidth)
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{
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nThumbWidth = m_intThumbMinWidth;
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fThumbWidth = m_intThumbMinWidth;
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}
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int nLeft = moThumbLeft;
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nLeft += btnWidth;
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Rectangle thumbrect = new Rectangle(new Point(nLeft, 1), new Size(nThumbWidth, this.Height - 2));
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//滑块
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if (thumbrect.Contains(ptPoint))
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{
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//hit the thumb
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nClickPoint = (ptPoint.X - nLeft);
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this.moThumbMouseDown = true;
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}
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else
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{
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//左按钮
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Rectangle leftarrowrect = new Rectangle(new Point(0, 1), new Size(btnWidth, this.Height));
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if (leftarrowrect.Contains(ptPoint))
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{
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int nRealRange = (Maximum - Minimum) - LargeChange;
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int nPixelRange = (nTrackWidth - nThumbWidth);
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if (nRealRange > 0)
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{
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if (nPixelRange > 0)
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{
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if ((moThumbLeft - SmallChange) < 0)
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moThumbLeft = 0;
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else
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moThumbLeft -= SmallChange;
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//figure out value
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float fPerc = (float)moThumbLeft / (float)nPixelRange;
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float fValue = fPerc * (Maximum - LargeChange);
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moValue = (int)fValue;
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if (ValueChanged != null)
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ValueChanged(this, new EventArgs());
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if (Scroll != null)
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Scroll(this, new EventArgs());
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Invalidate();
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}
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}
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}
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else
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{
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Rectangle rightarrowrect = new Rectangle(new Point(btnWidth + nTrackWidth, 1), new Size(btnWidth, this.Height));
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if (rightarrowrect.Contains(ptPoint))
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{
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int nRealRange = (Maximum - Minimum) - LargeChange;
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int nPixelRange = (nTrackWidth - nThumbWidth);
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if (nRealRange > 0)
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{
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if (nPixelRange > 0)
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{
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if ((moThumbLeft + SmallChange) > nPixelRange)
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moThumbLeft = nPixelRange;
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else
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moThumbLeft += SmallChange;
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//figure out value
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float fPerc = (float)moThumbLeft / (float)nPixelRange;
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float fValue = fPerc * (Maximum - LargeChange);
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moValue = (int)fValue;
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if (ValueChanged != null)
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ValueChanged(this, new EventArgs());
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if (Scroll != null)
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Scroll(this, new EventArgs());
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Invalidate();
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}
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}
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}
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}
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}
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}
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/// <summary>
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/// Handles the MouseUp event of the CustomScrollbar control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
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private void CustomScrollbar_MouseUp(object sender, MouseEventArgs e)
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{
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this.moThumbMouseDown = false;
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this.moThumbMouseDragging = false;
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Application.DoEvents();
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}
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/// <summary>
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/// Moves the thumb.
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/// </summary>
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/// <param name="x">The y.</param>
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private void MoveThumb(int x)
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{
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int nRealRange = Maximum - Minimum;
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int nTrackWidth = (this.Width - btnWidth * 2);
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// float fThumbWidth = ((float)LargeChange / (float)Maximum) * nTrackWidth;
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float fThumbWidth = nTrackWidth - Maximum;
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int nThumbWidth = (int)fThumbWidth;
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if (nThumbWidth > nTrackWidth)
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{
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nThumbWidth = nTrackWidth;
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fThumbWidth = nTrackWidth;
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}
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if (nThumbWidth < m_intThumbMinWidth)
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{
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nThumbWidth = m_intThumbMinWidth;
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fThumbWidth = m_intThumbMinWidth;
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}
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int nSpot = nClickPoint;
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int nPixelRange = (nTrackWidth - nThumbWidth);
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if (moThumbMouseDown && nRealRange > 0)
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{
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if (nPixelRange > 0)
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{
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int nNewThumbLeft = x - (btnWidth + nSpot);
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if (nNewThumbLeft < 0)
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{
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moThumbLeft = nNewThumbLeft = 0;
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}
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else if (nNewThumbLeft > nPixelRange)
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{
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moThumbLeft = nNewThumbLeft = nPixelRange;
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}
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else
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{
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moThumbLeft = x - (btnWidth + nSpot);
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}
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float fPerc = (float)moThumbLeft / (float)nPixelRange;
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float fValue = fPerc * (Maximum - (nNewThumbLeft == nPixelRange ? 0 : LargeChange));
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//float fValue = fPerc * (Maximum - LargeChange);
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if (Math.Abs(moValue - fValue) < 1)
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{
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return;
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}
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moValue = (int)fValue;
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Invalidate();
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try
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{
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Application.DoEvents();
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}
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catch { }
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}
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}
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}
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/// <summary>
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/// Handles the MouseMove event of the CustomScrollbar control.
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/// </summary>
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/// <param name="sender">The source of the event.</param>
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/// <param name="e">The <see cref="MouseEventArgs"/> instance containing the event data.</param>
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private void CustomScrollbar_MouseMove(object sender, MouseEventArgs e)
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{
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if (!moThumbMouseDown)
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return;
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if (moThumbMouseDown == true)
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{
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this.moThumbMouseDragging = true;
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}
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if (this.moThumbMouseDragging)
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{
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MoveThumb(e.X);
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}
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if (ValueChanged != null)
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ValueChanged(this, new EventArgs());
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if (Scroll != null)
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Scroll(this, new EventArgs());
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}
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#endregion
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protected override void OnPaint(PaintEventArgs e)
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{
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base.OnPaint(e);
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e.Graphics.SetGDIHigh();
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if (Maximum > 0)
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{
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//draw thumb
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int nTrackWidth = (this.Width - btnWidth * 2);
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//float fThumbWidth = ((float)LargeChange / (float)Maximum) * nTrackWidth;
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float fThumbWidth = nTrackWidth - Maximum;
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int nThumbWidth = (int)fThumbWidth;
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if (nThumbWidth > nTrackWidth)
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{
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nThumbWidth = nTrackWidth;
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fThumbWidth = nTrackWidth;
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}
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if (nThumbWidth < m_intThumbMinWidth)
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{
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nThumbWidth = m_intThumbMinWidth;
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fThumbWidth = m_intThumbMinWidth;
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}
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int nLeft = moThumbLeft;
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nLeft += btnWidth;
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if (nLeft + nThumbWidth > this.Width - btnWidth)
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nLeft = this.Width - btnWidth - nThumbWidth;
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e.Graphics.FillPath(new SolidBrush(thumbColor), new Rectangle(nLeft, 1, nThumbWidth, this.Height - 3).CreateRoundedRectanglePath(this.ConerRadius));
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}
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ControlHelper.PaintTriangle(e.Graphics, new SolidBrush(thumbColor), new Point(btnWidth - Math.Min(5, this.Height / 2), this.Height / 2), Math.Min(5, this.Height / 2), ControlHelper.GraphDirection.Leftward);
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ControlHelper.PaintTriangle(e.Graphics, new SolidBrush(thumbColor), new Point(this.Width - (btnWidth - Math.Min(5, this.Height / 2)), this.Height / 2), Math.Min(5, this.Height / 2), ControlHelper.GraphDirection.Rightward);
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}
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}
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}
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