c# - 禁用按钮时如何避免颜色变化？

Question

我们有一个带有很多 FlatStyle 按钮的 Windows 窗体项目。

当我们禁用按钮时，按钮的颜色会自动改变 :(

是否有可能以某种方式覆盖它，以便我们自己控制颜色？

Answer 1

您需要使用 EnabledChanged 事件来设置所需的颜色。这是一个例子。

private void Button1_EnabledChanged(object sender, System.EventArgs e)
{
Button1.ForeColor = sender.enabled == false ? Color.Blue : Color.Red;
Button1.BackColor = Color.AliceBlue;
}

根据您的要求使用所需的颜色。

您还需要使用绘画事件。

private void Button1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
dynamic btn = (Button)sender;
dynamic drawBrush = new SolidBrush(btn.ForeColor);
dynamic sf = new StringFormat {
    Alignment = StringAlignment.Center,
    LineAlignment = StringAlignment.Center };
Button1.Text = string.Empty;
e.Graphics.DrawString("Button1", btn.Font, drawBrush, e.ClipRectangle, sf);
drawBrush.Dispose();
sf.Dispose();

}

Answer 2

要获得不那么模糊的文本，请改用 TextRenderer 类：

private void Button1_Paint(object sender, PaintEventArgs e)
        {
            Button btn = (Button)sender;
            // make sure Text is not also written on button
            btn.Text = string.Empty;
            // set flags to center text on button
            TextFormatFlags flags = TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.WordBreak;   // center the text
            // render the text onto the button
            TextRenderer.DrawText(e.Graphics, "Hello", btn.Font, e.ClipRectangle, btn.ForeColor, flags);
        }

和 Harsh 的回答中的 Button1_EnabledChanged 方法。

Answer 3

在按钮的 EnableChanged 事件上

private void button1_EnabledChanged(object sender, EventArgs e)
    {
        if (button1.Enabled == false)
        {
            button1.ForeColor = Color.DarkGray; //or pick the color you want when not enabled
        }
        else
        {
            button1.ForeColor = Color.White; //same here with the color
        }
    }

Answer 4

当按钮部分重绘时，我使用 ClientRectangle 而不是 e.ClipRectangle 来避免剪辑效果：

e.Graphics.Clear(BackColor);
using (var drawBrush = new SolidBrush(ForeColor))
using (var sf = new StringFormat
{
    Alignment = StringAlignment.Center,
    LineAlignment = StringAlignment.Center
})
{
    e.Graphics.DrawString(Text, Font, drawBrush, ClientRectangle, sf);
}

Answer 5

我遵循以下方法：- 可以使用自定义变量控制按钮的 Click() 事件。

private bool btnDisabled;
private void btnClick(object sender, EventArgs e){
   if(!btnDisabled) return;}

这样按钮甚至不需要被禁用。该按钮仍然具有点击感，但不会执行任何操作。必须使用正确的颜色来传达按钮已禁用。

Answer 6

建议永远不会太晚：

public class BlackButton : Button
{
    #region #Private Members
    private bool m_BasePaint = false;
    #endregion #Private Members

    #region #Ctor
    public BlackButton() : base()
    {
        base.ForeColor = Color.White;
        base.BackColor = Color.Black;
        this.DisabledForeColor = Color.FromArgb(0x6D, 0x6D, 0x6D);
    }
    #endregion #Ctor

    #region #Public Interface
    public Color DisabledForeColor
    {
        get;
        set;
    }
    #endregion #Public Interface

    #region #Overrides
    public override string Text
    {
        get
        {
            if (m_BasePaint)
                return "";
            return base.Text;
        }
        set
        {
            base.Text = value;
        }
    }
    protected override void OnPaint(PaintEventArgs pevent)
    {
        m_BasePaint = true;
        base.OnPaint(pevent);
        m_BasePaint = false;

        TextFormatFlags flags = TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter | TextFormatFlags.WordBreak; 

        TextRenderer.DrawText(pevent.Graphics, 
            Text, 
            base.Font, 
            ClientRectangle, 
            base.Enabled ? base.ForeColor : this.DisabledForeColor, 
            flags);
    }
    #endregion #Overrides
}