如何更改组合框下拉按钮的颜色 [英] How to change the ComboBox dropdown button color
本文介绍了如何更改组合框下拉按钮的颜色的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
如何更改滑动按钮的颜色?不是边框颜色，也不是滑动项目的颜色.
我已经更改了幻灯片项目的颜色
有什么方法可以改变颜色?
解决方案
平面组合框-更改边框颜色和下拉按钮颜色
您需要亲自处理 WM_PAINT 并绘制边框和下拉矩形.内部
这是代码:
使用系统；使用System.ComponentModel;使用System.Drawing;使用System.Runtime.InteropServices;使用System.Windows.Forms;公共类FlatComboBox:ComboBox{私人颜色borderColor = Color.Gray;[DefaultValue(typeof(Color)，"Gray"))公共颜色BorderColor{得到{return borderColor;}放{如果(borderColor！=值){borderColor =值；Invalidate();}}}私人颜色buttonColor = Color.LightGray;[DefaultValue(typeof(Color)，"LightGray"))公共颜色ButtonColor{得到{return buttonColor;}放{如果(buttonColor！=值){buttonColor =值；Invalidate();}}}受保护的覆盖无效WndProc(参考消息m){如果(m.Msg == WM_PAINT& DropDownStyle！= ComboBoxStyle.Simple){var clientRect = ClientRectangle;var dropDownButtonWidth = SystemInformation.HorizontalScrollBarArrowWidth;var externalBorder = new Rectangle(clientRect.Location，new Size(clientRect.Width-1，clientRect.Height-1));var innerBorder =新Rectangle(outerBorder.X + 1，outerBorder.Y +1，outsideBorder.Width-dropDownButtonWidth-2，outerBorder.Height-2);var innerInnerBorder = new Rectangle(innerBorder.X + 1，innerBorder.Y + 1，innerBorder.Width-2，innerBorder.Height-2);var dropDownRect = new Rectangle(innerBorder.Right + 1，innerBorder.Y，dropDownButtonWidth，innerBorder.Height +1);如果(RightToLeft == RightToLeft.Yes){innerBorder.X = clientRect.Width-innerBorder.Right;innerInnerBorder.X = clientRect.Width-innerInnerBorder.Right;dropDownRect.X = clientRect.Width-dropDownRect.Right;dropDownRect.Width + = 1;}var innerBorderColor =启用?BackColor:SystemColors.Control;var externalBorderColor =启用?BorderColor:SystemColors.ControlDark;var buttonColor =启用?ButtonColor:SystemColors.Control;var middle = new Point(dropDownRect.Left + dropDownRect.Width/2，dropDownRect.Top + dropDownRect.Height/2);var arrow =新Point []{新点(中间X-3，中间Y-2)，新点(中间X + 4，中间Y-2)，新的Point(middle.X，middle.Y + 2)};var ps = new PAINTSTRUCT();bool shoulEndPaint = false;IntPtr dc;如果(m.WParam == IntPtr.Zero){dc = BeginPaint(Handle，ref ps);m.WParam = dc;shoulEndPaint = true;}别的{dc = m.WParam;}var rgn = CreateRectRgn(innerInnerBorder.Left，innerInnerBorder.Top，innerInnerBorder.Right，innerInnerBorder.Bottom)；SelectClipRgn(dc，rgn);DefWndProc(ref m);DeleteObject(rgn);rgn = CreateRectRgn(clientRect.Left，clientRect.Top，clientRect.Right，clientRect.Bottom)；SelectClipRgn(dc，rgn);使用(var g = Graphics.FromHdc(dc)){使用(var b = new SolidBrush(buttonColor)){g.FillRectangle(b，dropDownRect);}使用(var b = new SolidBrush(outerBorderColor)){g.FillPolygon(b，arrow);}使用(var p = new Pen(innerBorderColor)){g.DrawRectangle(p，innerBorder);g.DrawRectangle(p，innerInnerBorder);}使用(var p = new Pen(outerBorderColor)){g.DrawRectangle(p，externalBorder);}}如果(shoulEndPaint)EndPaint(Handle，ref ps);DeleteObject(rgn);}别的base.WndProc(ref m);}私有const int WM_PAINT = 0xF;[StructLayout(LayoutKind.Sequential)]公共结构{public int L，T，R，B;}[StructLayout(LayoutKind.Sequential)]公共结构PAINTSTRUCT{公共IntPtr hdc；公众嘲讽；public int rcPaint_left;public int rcPaint_top;public int rcPaint_right;public int rcPaint_bottom;公共布尔fRestore；公共布尔fIncUpdate;public int reserved1;public int reserved2;public int reserved3;public int reserved4;public int reserved5;public int reserved6;public int reserved7;public int reserved8;}[DllImport("user32.dll"))私有静态外部IntPtr BeginPaint(IntPtr hWnd，[In，Out] ref PAINTSTRUCT lpPaint);[DllImport("user32.dll"))私有静态外部布尔EndPaint(IntPtr hWnd，ref PAINTSTRUCT lpPaint);[DllImport("gdi32.dll"))公共静态外部int SelectClipRgn(IntPtr hDC，IntPtr hRgn);[DllImport("user32.dll"))公共静态外部int GetUpdateRgn(IntPtr hwnd，IntPtr hrgn，bool fErase);公共枚举RegionFlags{错误= 0，NULLREGION = 1SIMPLEREGION = 2COMPLEXREGION = 3，}[DllImport("gdi32.dll"))内部静态外部布尔DeleteObject(IntPtr hObject);[DllImport("gdi32.dll"))私有静态外部IntPtr CreateRectRgn(int x1，int y1，int x2，int y2);}
How could I change the slide button color? not border color and not slide item colors.
I already change the slide item colors
Is there any way to change the color?
解决方案
Flat ComboBox - Change border color and Dropdown button color
You need to handle WM_PAINT yourself and draw the border and the dropdown rectangle. This is the way that internal ComboBox.FlatComboAdapter class of .Net Framework works.
In this post, I've created a FlatComboBox, which draws the border and the dropdown in a flat style, having the following additional properties:
- BorderColor: used for border and for the dropdown arrow
- ButtonColor: used for dropdown area color.
Here is the code:
using System;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;
public class FlatComboBox : ComboBox
{
private Color borderColor = Color.Gray;
[DefaultValue(typeof(Color), "Gray")]
public Color BorderColor
{
get { return borderColor; }
set
{
if (borderColor != value)
{
borderColor = value;
Invalidate();
}
}
}
private Color buttonColor = Color.LightGray;
[DefaultValue(typeof(Color), "LightGray")]
public Color ButtonColor
{
get { return buttonColor; }
set
{
if (buttonColor != value)
{
buttonColor = value;
Invalidate();
}
}
}
protected override void WndProc(ref Message m)
{
if (m.Msg == WM_PAINT && DropDownStyle != ComboBoxStyle.Simple)
{
var clientRect = ClientRectangle;
var dropDownButtonWidth = SystemInformation.HorizontalScrollBarArrowWidth;
var outerBorder = new Rectangle(clientRect.Location,
new Size(clientRect.Width - 1, clientRect.Height - 1));
var innerBorder = new Rectangle(outerBorder.X + 1, outerBorder.Y + 1,
outerBorder.Width - dropDownButtonWidth - 2, outerBorder.Height - 2);
var innerInnerBorder = new Rectangle(innerBorder.X + 1, innerBorder.Y + 1,
innerBorder.Width - 2, innerBorder.Height - 2);
var dropDownRect = new Rectangle(innerBorder.Right + 1, innerBorder.Y,
dropDownButtonWidth, innerBorder.Height + 1);
if (RightToLeft == RightToLeft.Yes)
{
innerBorder.X = clientRect.Width - innerBorder.Right;
innerInnerBorder.X = clientRect.Width - innerInnerBorder.Right;
dropDownRect.X = clientRect.Width - dropDownRect.Right;
dropDownRect.Width += 1;
}
var innerBorderColor = Enabled ? BackColor : SystemColors.Control;
var outerBorderColor = Enabled ? BorderColor : SystemColors.ControlDark;
var buttonColor = Enabled ? ButtonColor : SystemColors.Control;
var middle = new Point(dropDownRect.Left + dropDownRect.Width / 2,
dropDownRect.Top + dropDownRect.Height / 2);
var arrow = new Point[]
{
new Point(middle.X - 3, middle.Y - 2),
new Point(middle.X + 4, middle.Y - 2),
new Point(middle.X, middle.Y + 2)
};
var ps = new PAINTSTRUCT();
bool shoulEndPaint = false;
IntPtr dc;
if (m.WParam == IntPtr.Zero)
{
dc = BeginPaint(Handle, ref ps);
m.WParam = dc;
shoulEndPaint = true;
}
else
{
dc = m.WParam;
}
var rgn = CreateRectRgn(innerInnerBorder.Left, innerInnerBorder.Top,
innerInnerBorder.Right, innerInnerBorder.Bottom);
SelectClipRgn(dc, rgn);
DefWndProc(ref m);
DeleteObject(rgn);
rgn = CreateRectRgn(clientRect.Left, clientRect.Top,
clientRect.Right, clientRect.Bottom);
SelectClipRgn(dc, rgn);
using (var g = Graphics.FromHdc(dc))
{
using (var b = new SolidBrush(buttonColor))
{
g.FillRectangle(b, dropDownRect);
}
using (var b = new SolidBrush(outerBorderColor))
{
g.FillPolygon(b, arrow);
}
using (var p = new Pen(innerBorderColor))
{
g.DrawRectangle(p, innerBorder);
g.DrawRectangle(p, innerInnerBorder);
}
using (var p = new Pen(outerBorderColor))
{
g.DrawRectangle(p, outerBorder);
}
}
if (shoulEndPaint)
EndPaint(Handle, ref ps);
DeleteObject(rgn);
}
else
base.WndProc(ref m);
}
private const int WM_PAINT = 0xF;
[StructLayout(LayoutKind.Sequential)]
public struct RECT
{
public int L, T, R, B;
}
[StructLayout(LayoutKind.Sequential)]
public struct PAINTSTRUCT
{
public IntPtr hdc;
public bool fErase;
public int rcPaint_left;
public int rcPaint_top;
public int rcPaint_right;
public int rcPaint_bottom;
public bool fRestore;
public bool fIncUpdate;
public int reserved1;
public int reserved2;
public int reserved3;
public int reserved4;
public int reserved5;
public int reserved6;
public int reserved7;
public int reserved8;
}
[DllImport("user32.dll")]
private static extern IntPtr BeginPaint(IntPtr hWnd,
[In, Out] ref PAINTSTRUCT lpPaint);
[DllImport("user32.dll")]
private static extern bool EndPaint(IntPtr hWnd, ref PAINTSTRUCT lpPaint);
[DllImport("gdi32.dll")]
public static extern int SelectClipRgn(IntPtr hDC, IntPtr hRgn);
[DllImport("user32.dll")]
public static extern int GetUpdateRgn(IntPtr hwnd, IntPtr hrgn, bool fErase);
public enum RegionFlags
{
ERROR = 0,
NULLREGION = 1,
SIMPLEREGION = 2,
COMPLEXREGION = 3,
}
[DllImport("gdi32.dll")]
internal static extern bool DeleteObject(IntPtr hObject);
[DllImport("gdi32.dll")]
private static extern IntPtr CreateRectRgn(int x1, int y1, int x2, int y2);
}
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