如何显示从ToolTip组件创建的ToolTipControl? [英] How to show created ToolTipControl from ToolTip Component?

问题描述

我创建了一个简单的控件，它充当工具提示，并且我已实现了根据需要实现在控件中绘制文本和绘制背景的功能.此控制端没有问题.

I have created a simple control which acts as a ToolTip and i have implemented drawing the text and painting the background in the control as my wish. No issues in this control side.

我还为ToolTip开发了一个组件，该组件将创建的ToolTip与控件集成在一起.这是组件类.

and also i have developed a component for ToolTip which integrates the created ToolTip with the controls. here is the component class.

[ProvideProperty("ToolTip", typeof(Control))]
public class ToolTipController : Component, IExtenderProvider
{
    public ToolTipController()
    {

    }




    Dictionary<Component, ToolTip> toolTipInfo = new Dictionary<Component, ToolTip>();

    Dictionary<Component, ToolTip> ToolTipInfo
    {
        get
        {
            return toolTipInfo;
        }
        set
        {
            toolTipInfo = value;
        }
    }


    public bool CanExtend(object extendee)
    {
        if (!(extendee is ToolTipController))
            return true;

        return false;
    }

    /// <summary>
    /// Provides value for the Extended property Tooltip for controls.
    /// </summary>
    /// <returns>Value of the extended property.</returns>
    public ToolTip GetToolTip(Component component)
    {
        if (ToolTipInfo.ContainsKey(component))
            return toolTipInfo[component];
        return null;
    }

    public void SetToolTip(Control control, ToolTip toolTip)
    {
        if (toolTip == null)
            return;
        if (!ToolTipInfo.ContainsKey(control))
        {
            ToolTipInfo.Add(control, toolTip);

            toolTip.AddControl(control);
        }
        else
            toolTipInfo[control] = toolTip;
    }



}

这里是工具提示的控件.

Here is the Control for ToolTip.

public class ToolTip : Control
{
    #region Private Variables
    RightToLeft rightToLeft = RightToLeft.No;
    Dictionary<IntPtr, Component> components;
    TOOLINFO toolInfo;
    Color foreColor;
    Color backColor;
    private string tipText;
    Dictionary<ContentAlignment, TextFormatFlags> formatFlags;
    #endregion Private variables


    public ToolTip()
    {

        toolInfo = new TOOLINFO();
        components = new Dictionary<IntPtr, Component>();



        formatFlags = new Dictionary<ContentAlignment, TextFormatFlags>();
        formatFlags[ContentAlignment.TopLeft] = TextFormatFlags.Default;
        formatFlags[ContentAlignment.TopCenter] = TextFormatFlags.Top | TextFormatFlags.HorizontalCenter;
        formatFlags[ContentAlignment.TopRight] = TextFormatFlags.Top | TextFormatFlags.Right;
        formatFlags[ContentAlignment.MiddleLeft] = TextFormatFlags.VerticalCenter | TextFormatFlags.Left;
        formatFlags[ContentAlignment.MiddleCenter] = TextFormatFlags.VerticalCenter | TextFormatFlags.HorizontalCenter;
        formatFlags[ContentAlignment.MiddleRight] = TextFormatFlags.VerticalCenter | TextFormatFlags.Right;
        formatFlags[ContentAlignment.BottomLeft] = TextFormatFlags.Bottom | TextFormatFlags.Left;
        formatFlags[ContentAlignment.BottomCenter] = TextFormatFlags.Bottom | TextFormatFlags.HorizontalCenter;
        formatFlags[ContentAlignment.BottomRight] = TextFormatFlags.Bottom | TextFormatFlags.Right;
    }


    #region Properties
    /// <summary>
    /// Gets or sets the RightToLeft value of the ToolTip.
    /// </summary>
    public RightToLeft RightToLeft
    {
        get
        {
            return rightToLeft;
        }
        set
        {
            rightToLeft = value;
        }
    }

    /// <summary>
    /// Gets or sets the Text to be drawn in the ToolTip.
    /// </summary>
    public string TipText
    {
        get
        {
            return tipText;
        }
        set
        {
            tipText = value;
        }
    }

    /// <summary>
    /// Gets or sets the ForeColor of the ToolTip.
    /// </summary>
    public Color ForeColor
    {
        get
        {
            if (foreColor == null)
                return base.ForeColor;
            return foreColor;
        }
        set
        {
            foreColor = value;
        }
    }

    /// <summary>
    /// Gets or sets the BackColor of the ToolTip.
    /// </summary>
    public Color BackColor
    {
        get
        {
            if (backColor == null)
                return base.BackColor;
            return backColor;
        }
        set
        {
            backColor = value;
        }
    }
    #endregion Properties

    internal void AddControl(Component component)
    {
        if (component != null)
        {
            if (component is Control)
            {
                Control control = component as Control;

                control.HandleCreated += new EventHandler(Control_HandleCreated);
                control.HandleDestroyed += new EventHandler(Control_HandleDestroyed);

                if (control.IsHandleCreated)
                {
                    Control_HandleCreated(control, EventArgs.Empty);
                }
            }

        }
    }

    void Control_HandleDestroyed(object sender, EventArgs e)
    {


    }

    public const int TTF_IDISHWND = 0x0001;
    public const int TTF_SUBCLASS = 0x0010;
    public const int TTF_TRANSPARENT = 0x0100;

    public const int LPSTR_TEXTCALLBACKW = -1;

    private TOOLINFO GetTOOLINFO(Control ctl)
    {
        TOOLINFO toolinfo = new TOOLINFO();
        toolinfo.cbSize = Marshal.SizeOf(typeof(TOOLINFO));
        toolinfo.hwnd = this.Handle;
        toolinfo.uFlags = TTF_TRANSPARENT | TTF_SUBCLASS | TTF_IDISHWND;
        toolinfo.uId = ctl.Handle;
        toolinfo.lpszText = LPSTR_TEXTCALLBACKW;
        return toolinfo;
    }

    void Control_HandleCreated(object sender, EventArgs e)
    {
        Control control = sender as Control;
        if (control != null)
        {
            components[control.Handle] = control;
            toolInfo = this.GetTOOLINFO(control);


            NativeTip.SendMessage(new HandleRef(this, this.Handle), 1074, 0, ref toolInfo);
        }
    }

    #region Overrides
    protected override void OnHandleCreated(EventArgs e)
    {
        base.OnHandleCreated(e);

        int style = NativeTip.GetWindowLong(this.Handle, (int)SetWindowLongOffsets.GWL_STYLE);
        NativeTip.SetWindowLong(this.Handle, (int)SetWindowLongOffsets.GWL_STYLE, style & ~(int)WindowStyles.WS_BORDER);

    }


    protected override void OnSizeChanged(EventArgs e)
    {
        base.OnSizeChanged(e);
    }


    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        LinearGradientBrush brush = new LinearGradientBrush(e.ClipRectangle, Color.Red, Color.Black, LinearGradientMode.Horizontal);

        TextFormatFlags textFormatFlags = TXTFORMAT.COMMON;
        textFormatFlags |= TextFormatFlags.RightToLeft;


        TextRenderer.DrawText(e.Graphics, this.TipText, this.Font, e.ClipRectangle, this.ForeColor, textFormatFlags);
    }

    protected override void OnPaintBackground(PaintEventArgs e)
    {
        base.OnPaintBackground(e);
        SolidBrush brush = new SolidBrush(this.BackColor);
        e.Graphics.FillRectangle(brush, e.ClipRectangle);
    }

    protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);

    }

    #endregion Overrides

}

我已将工具提示与以下代码集成在一起，

I have integrated the ToolTip with below code,

ToolTipController controller = new ToolTipController();

ToolTip toolTip = new ToolTip();
toolTip.TipText = "My test tip";

controller.SetToolTip(this.button1, toolTip);

但是创建的工具提示与按钮不相关.

But the created tooltip is not associated with the button.

有人知道如何在将鼠标悬停在其他控件上时显示创建的ToolTip控件吗?

Does anyone know how to show the created ToolTip control while hovering in other controls?

关于， 阿马尔·拉吉(Amal Raj)

Regards, Amal Raj

推荐答案

从我的一个程序中摘录一个片段，添加一个鼠标悬停事件，并在其中添加它，您还可以为没有它们的控件提供工具提示.

Heres a snippet from one of my programs, add a mouse hover event and inside add this, you can also make tooltips for controls that dont have them.

ToolTip dockItem = new ToolTip();
dockItem.SetToolTip(this.pictureBox1, Path.GetFileName(DeskDocker.Properties.Settings.Default.DockItem1));

这篇关于如何显示从ToolTip组件创建的ToolTipControl?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！