#region License Information
/* HeuristicLab
* Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
*
* This file is part of HeuristicLab.
*
* HeuristicLab is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* HeuristicLab is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with HeuristicLab. If not, see .
*/
#endregion
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment.Views {
public partial class ToolTipComboBox : ComboBox {
private ComboBoxState comboBoxState = ComboBoxState.Normal;
public ToolTipComboBox()
: base() {
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.UserPaint, true);
InitializeComponent();
DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
DropDownStyle = ComboBoxStyle.DropDownList;
}
protected override void OnDrawItem(DrawItemEventArgs e) {
var args = new ToolTipRequiredEventArgs(e.Index, Items[e.Index]);
OnToolTipRequired(args);
if (!e.State.HasFlag(DrawItemState.ComboBoxEdit) && !string.IsNullOrEmpty(args.ToolTip)) {
var ttRect = e.Graphics.MeasureString(args.ToolTip, Font);
if (RectangleToScreen(e.Bounds).Right + ttRect.Width > Screen.FromControl(this).Bounds.Right)
toolTip.Show(args.ToolTip, this, e.Bounds.Left - (int)Math.Ceiling(ttRect.Width), e.Bounds.Bottom);
else toolTip.Show(args.ToolTip, this, e.Bounds.Right, e.Bounds.Bottom);
} else toolTip.Hide(this);
e.DrawBackground();
DrawItemText(e.Graphics, e.Bounds, e.Index);
e.DrawFocusRectangle();
base.OnDrawItem(e);
}
protected override void OnDropDownClosed(EventArgs e) {
base.OnDropDownClosed(e);
toolTip.Hide(this);
}
private void DrawItemText(Graphics graphics, Rectangle rectangle, int index) {
if (index == -1 || Items.Count == 0)
return;
using (var b = new SolidBrush(ForeColor)) {
graphics.DrawString(GetItemText(Items[index]), Font, b, rectangle);
}
}
protected override void OnPaint(PaintEventArgs e) {
base.OnPaint(e);
if (Enabled == false) comboBoxState = ComboBoxState.Disabled;
if (VisualStyleInformation.IsSupportedByOS && VisualStyleInformation.IsEnabledByUser) {
PushButtonState pb_State = PushButtonState.Normal;
if (comboBoxState == ComboBoxState.Disabled)
pb_State = PushButtonState.Disabled;
else if (comboBoxState == ComboBoxState.Hot)
pb_State = PushButtonState.Hot;
else if (comboBoxState == ComboBoxState.Pressed)
pb_State = PushButtonState.Pressed;
Rectangle r = e.ClipRectangle;
r.Inflate(1, 1);
ButtonRenderer.DrawButton(e.Graphics, r, pb_State);
r = new Rectangle(e.ClipRectangle.Right - SystemInformation.VerticalScrollBarWidth + 2,
e.ClipRectangle.Top,
SystemInformation.VerticalScrollBarWidth - 4,
e.ClipRectangle.Height);
DrawArrow(e.Graphics, r);
} else {
ComboBoxRenderer.DrawTextBox(e.Graphics, e.ClipRectangle, comboBoxState);
Rectangle r = new Rectangle(e.ClipRectangle.Right - SystemInformation.VerticalScrollBarWidth,
e.ClipRectangle.Top,
SystemInformation.VerticalScrollBarWidth,
e.ClipRectangle.Height);
ComboBoxRenderer.DrawDropDownButton(e.Graphics, r, comboBoxState);
}
Rectangle rect = e.ClipRectangle;
rect.Inflate(-2, -4);
rect.Offset(1, 0);
DrawItemText(e.Graphics, rect, SelectedIndex);
}
private void DrawArrow(Graphics g, Rectangle rect) {
Point p1 = new Point(rect.X + 3, rect.Y + rect.Height / 2 - 2);
Point p2 = new Point(rect.X + rect.Width - 3, rect.Y + rect.Height / 2 - 2);
Point p3 = new Point(rect.X + rect.Width / 2, rect.Y + rect.Height / 2 + 2);
g.FillPolygon(new SolidBrush(System.Drawing.SystemColors.ControlText), new Point[] { p1, p2, p3 });
}
protected override void OnMouseEnter(EventArgs e) {
base.OnMouseEnter(e);
comboBoxState = ComboBoxState.Hot;
}
protected override void OnMouseLeave(EventArgs e) {
base.OnMouseLeave(e);
comboBoxState = ComboBoxState.Normal;
}
protected override void OnMouseDown(MouseEventArgs e) {
base.OnMouseDown(e);
comboBoxState = ComboBoxState.Pressed;
}
protected override void OnMouseUp(MouseEventArgs e) {
base.OnMouseUp(e);
if (Top <= e.Y && Bottom >= e.Y && Left < e.X && Right > e.X)
comboBoxState = ComboBoxState.Hot;
else comboBoxState = ComboBoxState.Normal;
}
public event EventHandler ToolTipRequired;
protected virtual void OnToolTipRequired(ToolTipRequiredEventArgs args) {
var handler = ToolTipRequired;
if (handler != null) handler(this, args);
}
}
}