为什么按钮会闪烁？

Question

当我进入主按钮时，我有 2 个按钮（从现在开始自定义按钮）添加到按钮的控件（从现在开始是主按钮）我希望自定义按钮显示 ImageBackground，它的工作方式除外。现在，当我用鼠标输入自定义按钮时，我希望 2 ImageBackground 再次出现，当发生这种情况时，我希望主按钮保持与我第一次用鼠标输入时相同的颜色，这发生在我想要它，但按钮在闪烁，有时当我输入另一个主按钮的自定义按钮时，前一个按钮仍处于 mouseEnter 状态。这是为什么？我需要使用 async/await 或类似的东西吗？

我想可能是因为它必须在它发生时进行编译，这需要一点时间，这就是它闪烁的原因，这就是我认为我需要使用 async/await 的原因，但这确实是新的对我来说，所以我不知道如何使用它。

public class MyButton : Button
    {
        public MyButton()
        {
            SetStyle(ControlStyles.StandardClick | ControlStyles.StandardDoubleClick | ControlStyles.UserMouse, true);

            Margin = new Padding(0);
            TextAlign = ContentAlignment.TopCenter;
            ImageAlign = ContentAlignment.TopLeft;
            TextImageRelation = TextImageRelation.ImageBeforeText;
            Font = new Font("Century Gothic", 11f, FontStyle.Bold);
            Size = new Size(200, 75);
            FlatStyle = FlatStyle.Flat;
            BackColor = Color.FromArgb(0, 255, 255, 255);
            FlatAppearance.MouseOverBackColor = ColorTranslator.FromHtml("#64A4B3B6");
            FlatAppearance.BorderSize = 2;
            FlatAppearance.BorderColor = Color.FromArgb(0, 255, 255, 255);

            Button[] custom = CustomButtons();
            for (int i = 0; i < 2; i++)
            {
                Controls.Add(custom[i]);
                Controls[i].MouseHover += CustomOnMouseEnter;
            }

            MouseEnter += OnMouseEnter;
            MouseLeave += OnMouseLeave;
        }

        private Button[] CustomButtons()
        {

            Button delete = new Button();
            delete.Name = "delete";
            delete.Location = new Point(this.Size.Width - 22, 2);
            delete.Size = new Size(20, 20);
            delete.FlatStyle = FlatStyle.Flat;
            delete.BackColor = Color.Transparent;
            delete.FlatAppearance.MouseOverBackColor = ColorTranslator.FromHtml("#64A4B3B6");
            delete.FlatAppearance.BorderSize = 0;

            Button customize = new Button();
            customize.Name = "customize";
            customize.Location = new Point(delete.Left - 20, delete.Top);
            customize.Size = new Size(20, 20);
            customize.FlatStyle = FlatStyle.Flat;
            customize.BackColor = Color.Transparent;
            customize.FlatAppearance.MouseOverBackColor = ColorTranslator.FromHtml("#64A4B3B6");
            customize.FlatAppearance.BorderSize = 0;

            Button[] buttons = { delete, customize };
            return buttons;
        }

        private void OnMouseLeave(object sender, EventArgs e)
        {
            if (Controls.Count != 0)
            {
                Controls[0].BackgroundImage = null;
                Controls[1].BackgroundImage = null;
            }

            if (BackColor != ColorTranslator.FromHtml("#64389eed"))
            {
                BackColor = Color.FromArgb(0, 255, 255, 255);
            }
        }

        private void OnMouseEnter(object sender, EventArgs e)
        {
            if (Controls.Count != 0)
            {
                Controls[0].BackgroundImage = Resources.cross;
                Controls[1].BackgroundImage = Resources.settings;
            }
        }

        private void CustomOnMouseEnter(object sender, EventArgs e)
        {
            this.BackColor = ColorTranslator.FromHtml("#64A4B3B6");
            Controls[0].BackgroundImage = Resources.cross;
            Controls[1].BackgroundImage = Resources.settings;
        }
    }

这是这段代码的输出你可以看到当我输入自定义按钮时闪烁以及上一个按钮处于 MouseEnter 状态的方式，即使我离开了它！

非常感谢您的帮助！

Answer 1

主要问题是 "OnMouseLeave" 不仅在鼠标离开整个控件时被调用，而且在鼠标进入两个小按钮中的任何一个时也会被调用，因为它们与父按钮重叠。您还应该使用 "MouseEnter" 事件而不是 "MouseHover".

您会在下面找到一个应该可以解决问题的稍微简化的版本。 "inside" 字段包含 "enters" 的数量减去整个控件的 "leaves" 的数量。如果它的值大于零，则鼠标在控件内，包括两个小按钮。

public class MyButton : Button
{
    Image[] images;
    Button[] custom;
    Color hilited = ColorTranslator.FromHtml("#64A4B3B6");
    int inside;

    public MyButton()
    {
        SetStyle(ControlStyles.StandardClick | ControlStyles.StandardDoubleClick | ControlStyles.UserMouse, true);

        Margin = new Padding(0);
        TextAlign = ContentAlignment.TopCenter;
        ImageAlign = ContentAlignment.TopLeft;
        TextImageRelation = TextImageRelation.ImageBeforeText;
        Font = new Font("Century Gothic", 11f, FontStyle.Bold);
        Size = new Size(200, 75);
        FlatStyle = FlatStyle.Flat;
        BackColor = Color.Transparent;
        FlatAppearance.MouseOverBackColor = hilited;
        FlatAppearance.BorderSize = 2;
        FlatAppearance.BorderColor = Color.FromArgb(0, 255, 255, 255);

        images = new Image[] { Resources.cross, Resources.settings };
        custom = CustomButtons();
        for (int i = 0; i < 2; i++)
        {
            Controls.Add(custom[i]);
            Controls[i].MouseEnter += CommonEnter;
            Controls[i].MouseLeave += CommonLeave;
        }

        MouseEnter += CommonEnter;
        MouseLeave += CommonLeave;
    }

    private Button[] CustomButtons()
    {
        Button delete = new Button();
        delete.Name = "delete";
        delete.Location = new Point(this.Size.Width - 22, 2);
        delete.Size = new Size(20, 20);
        delete.FlatStyle = FlatStyle.Flat;
        delete.BackColor = Color.Transparent;
        delete.FlatAppearance.MouseOverBackColor = hilited;
        delete.FlatAppearance.BorderSize = 0;

        Button customize = new Button();
        customize.Name = "customize";
        customize.Location = new Point(delete.Left - 20, delete.Top);
        customize.Size = new Size(20, 20);
        customize.FlatStyle = FlatStyle.Flat;
        customize.BackColor = Color.Transparent;
        customize.FlatAppearance.MouseOverBackColor = hilited;
        customize.FlatAppearance.BorderSize = 0;

        return new Button[] { delete, customize };
    }

    void CommonEnter(object sender, EventArgs e)
    {
        if (inside++ == 0)
        {
            BackColor = hilited;
            custom[0].BackgroundImage = images[0];
            custom[1].BackgroundImage = images[1];
        }
    }

    void CommonLeave(object sender, EventArgs e)
    {
        if (--inside == 0)
        {
            BackColor = Color.Transparent;
            custom[0].BackgroundImage = null;
            custom[1].BackgroundImage = null;
        }
    }
}

为什么按钮会闪烁？

Why does the button flicker?

c#

controls

button

winforms