c# - 简单的按钮动画

Question

我正在尝试学习 .NET 编程。作为我学习的一部分，我尝试在按钮上制作一些效果。它正在工作......但没有我想象的那么顺利!有没有更好的方法来做到这一点？提前致谢!

我的需求:

有 3 个按钮。 当您将鼠标悬停在其中一个按钮上时，它会展开，当您将鼠标从该按钮上移开时，它会恢复到初始大小。

private void button1_MouseHover(object sender, EventArgs e)
    {
        button1.BackColor = Color.White;
        button1.Width = 130;
        button1.BringToFront();            
    }

    private void button1_MouseLeave(object sender, EventArgs e)
    {
        button1.BackColor = Color.Red;
        button1.Width = 75;         
    }

    private void button2_MouseHover(object sender, EventArgs e)
    {
        button2.BackColor = Color.Gray;
        button2.Width = 130;
        button2.BringToFront();            
    }

    private void Form1_MouseLeave(object sender, EventArgs e)
    {
        button2.BackColor = Color.Red;
        button2.Width = 75;

    }

    private void button3_MouseHover(object sender, EventArgs e)
    {
        button3.BackColor = Color.DimGray;
        button3.Width = 130;
        button3.BringToFront();
    }

    private void button3_MouseLeave(object sender, EventArgs e)
    {
        button3.BackColor = Color.Red;
        button3.Width = 75;

    }

Answer 1

所以首先，您不想做 3 次完全相同的事情。创建一个方法来为按钮添加适当的处理程序，然后只需编写代码一次即可处理任何给定的按钮。

请注意，您可以进入扩展/收缩报价处理程序并使用 percentComplete值来设置高度，沿光谱移动颜色(虽然这将涉及一些颜色数学)或改变按钮的任何其他方面。如果您真的有动力将其概括化，您可以向 Action<double> 的方法添加一个参数。根据给定的进度百分比对对象执行某些操作。

public void AddAnimation(Button button)
{
    var expandTimer = new System.Windows.Forms.Timer();
    var contractTimer = new System.Windows.Forms.Timer();

    expandTimer.Interval = 10;//can adjust to determine the refresh rate
    contractTimer.Interval = 10;

    DateTime animationStarted = DateTime.Now;

    //TODO update as appropriate or make it a parameter
    TimeSpan animationDuration = TimeSpan.FromMilliseconds(250);
    int initialWidth = 75;
    int endWidth = 130;

    button.MouseHover += (_, args) =>
    {
        contractTimer.Stop();
        expandTimer.Start();
        animationStarted = DateTime.Now;
        button.BackColor = Color.DimGray;
    };

    button.MouseLeave += (_, args) =>
    {
        expandTimer.Stop();
        contractTimer.Start();
        animationStarted = DateTime.Now;
        button.BackColor = Color.Red;
    };

    expandTimer.Tick += (_, args) =>
    {
        double percentComplete = (DateTime.Now - animationStarted).Ticks
            / (double)animationDuration.Ticks;

        if (percentComplete >= 1)
        {
            expandTimer.Stop();
        }
        else
        {
            button.Width = (int)(initialWidth +
                (endWidth - initialWidth) * percentComplete);
        }
    };

    contractTimer.Tick += (_, args) =>
    {
        double percentComplete = (DateTime.Now - animationStarted).Ticks
            / (double)animationDuration.Ticks;

        if (percentComplete >= 1)
        {
            contractTimer.Stop();
        }
        else
        {
            button.Width = (int)(endWidth -
                (endWidth - initialWidth) * percentComplete);
        }
    };
}