WinForm 窗口缩放动画效果

using System;

using System.Collections.Generic;

using System.Text;

using System.Threading;

using System.Windows.Forms;

using System.Drawing;

using System.Diagnostics;

namespace AnimatedTransform

{

static class FormTransform

{

public static void TransformSize(Form frm, int newWidth, int newHeight)

{

TransformSize(frm, new Size(newWidth, newHeight));

}

public static void TransformSize(Form frm, Size newSize)

{

ParameterizedThreadStart threadStart = new ParameterizedThreadStart(RunTransformation);

Thread transformThread = new Thread(threadStart);

transformThread.Start(new object[] { frm, newSize });

}

private delegate void RunTransformationDelegate(object paramaters);

private static void RunTransformation(object parameters)

{

Form frm = (Form)((object[])parameters)[0];

if (frm.InvokeRequired)

{

RunTransformationDelegate del = new RunTransformationDelegate(RunTransformation);

frm.Invoke(del, parameters);

}

else

{

//动画的变量參数

double FPS = 300.0;

long interval = (long)(Stopwatch.Frequency / FPS);

long ticks1 = 0;

long ticks2 = 0;

//传进来的新的窗口的大小

Size size = (Size)((object[])parameters)[1];

int xDiff = Math.Abs(frm.Width - size.Width);

int yDiff = Math.Abs(frm.Height - size.Height);

int step = 10;

int xDirection = frm.Width < size.Width ? 1 : -1;

int yDirection = frm.Height < size.Height ? 1 : -1;

int xStep = step * xDirection;

int yStep = step * yDirection;

//要调整的窗口的宽度是否在步长之内

bool widthOff = IsWidthOff(frm.Width, size.Width, xStep);

//要调整的窗口的高度是否在步长之内

bool heightOff = IsHeightOff(frm.Height, size.Height, yStep);

while (widthOff || heightOff)

{

//获取当前的时间戳

ticks2 = Stopwatch.GetTimestamp();

//同意调整大小仅在有足够的时间来刷新窗口的时候

if (ticks2 >= ticks1 + interval)

{

//调整窗口的大小

if (widthOff)

frm.Width += xStep;

if (heightOff)

frm.Height += yStep;

widthOff = IsWidthOff(frm.Width, size.Width, xStep);

heightOff = IsHeightOff(frm.Height, size.Height, yStep);

//同意窗口刷新

Application.DoEvents();

//保存当前的时间戳

ticks1 = Stopwatch.GetTimestamp();

}

Thread.Sleep(1);

}

}

}

private static bool IsWidthOff(int currentWidth, int targetWidth, int step)

{

//目标宽度与当前宽度是否在步长之内，假设是，返回false

if (Math.Abs(currentWidth - targetWidth) <= Math.Abs(step)) return false;

return (step > 0 && currentWidth < targetWidth) ||

(step < 0 && currentWidth > targetWidth);

}

private static bool IsHeightOff(int currentHeight, int targetHeight, int step)

{

//目标高度与当前高度是否在步长之内，假设是，返回false

if (Math.Abs(currentHeight - targetHeight) <= Math.Abs(step)) return false;

return (step > 0 && currentHeight < targetHeight) ||

(step < 0 && currentHeight > targetHeight);

}

}

}

调用方法：

Random random = new Random();

int width = random.Next(100, 500);//随机数产生窗口的宽

int height = random.Next(50, 800);//随机数产生窗口的高

FormTransform.TransformSize(this, width, height);

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