WPF窗体缩放移动-实现代码

最新推荐文章于 2025-06-03 16:33:33 发布

qinzhich

最新推荐文章于 2025-06-03 16:33:33 发布

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分类专栏： WPF

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本文介绍了一个WPF窗体缩放和移动的实现方法，通过处理WM_NCHITTEST消息，实现了窗口边角和边框的拖动效果，允许用户自由调整窗口大小和位置。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Interop;

namespace WpfSample
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}

//可在OnLoad、OnSourceInitialized过程中添加WPF对Windows处理机制
protected override void OnSourceInitialized(EventArgs e)
{
base.OnSourceInitialized(e);
//方法I
HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
//方法II
//HwndSource hwndSource = HwndSource.FromHwnd((new WindowInteropHelper(this)).Handle);
if (hwndSource != null)
{
hwndSource.AddHook(this.WndProc);
}
}

private const int WM_NCHITTEST = 0x0084;
private readonly int agWidth = 12; //拐角宽度
private readonly int bThickness = 4; // 边框宽度
private Point mousePoint = new Point(); //鼠标坐标

/// <summary>
/// 窗体缩放移动处理代码
/// </summary>
/// <param name="hwnd"></param>
/// <param name="msg"></param>
/// <param name="wParam"></param>
/// <param name="lParam"></param>
/// <param name="handled"></param>
/// <returns></returns>
protected virtual IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case WM_NCHITTEST:
this.mousePoint.X = (lParam.ToInt32() & 0xFFFF);
this.mousePoint.Y = (lParam.ToInt32() >> 16);

// 窗口左上角
if (this.mousePoint.Y - this.Top <= this.agWidth
&& this.mousePoint.X - this.Left <= this.agWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTTOPLEFT);
}
// 窗口左下角
else if (this.ActualHeight + this.Top - this.mousePoint.Y <= this.agWidth
&& this.mousePoint.X - this.Left <= this.agWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMLEFT);
}
// 窗口右上角
else if (this.mousePoint.Y - this.Top <= this.agWidth
&& this.ActualWidth + this.Left - this.mousePoint.X <= this.agWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTTOPRIGHT);
}
// 窗口右下角
else if (this.ActualWidth + this.Left - this.mousePoint.X <= this.agWidth
&& this.ActualHeight + this.Top - this.mousePoint.Y <= this.agWidth)
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOMRIGHT);
}
// 窗口左侧
else if (this.mousePoint.X - this.Left <= this.bThickness)
{
handled = true;
return new IntPtr((int)HitTest.HTLEFT);
}
// 窗口右侧
else if (this.ActualWidth + this.Left - this.mousePoint.X <= this.bThickness)
{
handled = true;
return new IntPtr((int)HitTest.HTRIGHT);
}
// 窗口上方
else if (this.mousePoint.Y - this.Top <= this.bThickness)
{
handled = true;
return new IntPtr((int)HitTest.HTTOP);
}
// 窗口下方
else if (this.ActualHeight + this.Top - this.mousePoint.Y <= this.bThickness)
{
handled = true;
return new IntPtr((int)HitTest.HTBOTTOM);
}
else // 窗口移动
{
handled = true;
return new IntPtr((int)HitTest.HTCAPTION);
}
}
return IntPtr.Zero;
}
}

/// <summary>
/// WM_NCHITTEST message
/// 详细请看:http://msdn.microsoft.com/en-us/library/ms645618(VS.85).aspx
/// </summary>
public enum HitTest : int
{
HTERROR = -2,
HTTRANSPARENT = -1,
HTNOWHERE = 0,
HTCLIENT = 1,
HTCAPTION = 2,
HTSYSMENU = 3,
HTGROWBOX = 4,
HTSIZE = HTGROWBOX,
HTMENU = 5,
HTHSCROLL = 6,
HTVSCROLL = 7,
HTMINBUTTON = 8,
HTMAXBUTTON = 9,
HTLEFT = 10,
HTRIGHT = 11,
HTTOP = 12,
HTTOPLEFT = 13,
HTTOPRIGHT = 14,
HTBOTTOM = 15,
HTBOTTOMLEFT = 16,
HTBOTTOMRIGHT = 17,
HTBORDER = 18,
HTREDUCE = HTMINBUTTON,
HTZOOM = HTMAXBUTTON,
HTSIZEFIRST = HTLEFT,
HTSIZELAST = HTBOTTOMRIGHT,
HTOBJECT = 19,
HTCLOSE = 20,
HTHELP = 21,
}
}