Display a tooltip over a button using Windows Form

问题:

How can I display a tooltip over a button using Windows Forms?

回答1:

The ToolTip is actually a WinForms control that handles displaying tool tips for multiple elements on a single form.

Say your button is called MyButton.

1. Add a ToolTip control (under Common Controls in the Windows Forms toolbox) to your form.
2. Give it a name - say MyToolTip
3. Set the "Tooltip on MyToolTip" property of MyButton (under Misc in the button property grid) to the text that should appear when you hover over it.

The tooltip will automatically appear when the cursor hovers over the button, but if you need to display it programatically, call

MyToolTip.Show("Tooltip text goes here", MyButton)

in your code to show the tooltip, and MyToolTip.Hide(MyButton) to make it disappear again.

回答2:

Using the form designer:

• Drag the ToolTip control from the Toolbox, onto the form.
• Select the properties of the control you want the tool tip to appear on.
• Find the property 'ToolTip on toolTip1' (the name may not be toolTip1 if you changed it's default name).
• Set the text of the property to the tool tip text you would like to display.

You can set also the tool tip programatically using the following call:

this.toolTip1.SetToolTip(this.targetControl, "My Tool Tip");

回答3:

You can use the ToolTip class:

Creating a ToolTip for a Control

Example:

private void Form1_Load(object sender, System.EventArgs e)
{
    System.Windows.Forms.ToolTip ToolTip1 = new System.Windows.Forms.ToolTip();
    ToolTip1.SetToolTip(this.Button1, "Hello");
}

回答4:

For default tooltip this can be used -

System.Windows.Forms.ToolTip ToolTip1 = new System.Windows.Forms.ToolTip();
ToolTip1.SetToolTip(this.textBox1, "Hello world");

A customized tooltip can also be used in case if formatting is required for tooltip message. This can be created by custom formatting the form and use it as tooltip dialog on mouse hover event of the control. Please check following link for more details -

http://newapputil.blogspot.in/2015/08/create-custom-tooltip-dialog-from-form.html

回答5:

The .NET framework provides a ToolTip class. Add one of those to your form and then on the MouseHover event for each item you would like a tooltip for, do something like the following:

    private void checkBox1_MouseHover(object sender, EventArgs e)
    {
        toolTip1.Show("text", checkBox1);
    }

回答6:

Lazy and compact storing text in the Tag property

If you are a bit lazy and do not use the Tag property of the controls for anything else you can use it to store the tooltip text and assign MouseHover event handlers to all such controls in one go like this:

    private System.Windows.Forms.ToolTip ToolTip1;
    private void PrepareTooltips()
    {
        ToolTip1 = new System.Windows.Forms.ToolTip();
        foreach(Control ctrl in this.Controls)
        {
            if (ctrl is Button && ctrl.Tag is string)
            {
                ctrl.MouseHover += new EventHandler(delegate(Object o, EventArgs a)
                {
                    var btn = (Control)o;
                    ToolTip1.SetToolTip(btn, btn.Tag.ToString());
                });
            }
        }
    }

In this case all buttons having a string in the Tag property is assigned a MouseHover event. To keep it compact the MouseHover event is defined inline using a lambda expression. In the event any button hovered will have its Tag text assigned to the Tooltip and shown.

回答7:

private void Form1_Load(object sender, System.EventArgs e)
{
    ToolTip toolTip1 = new ToolTip();
    toolTip1.AutoPopDelay = 5000;
    toolTip1.InitialDelay = 1000;
    toolTip1.ReshowDelay = 500;
    toolTip1.ShowAlways = true;
    toolTip1.SetToolTip(this.button1, "My button1");
    toolTip1.SetToolTip(this.checkBox1, "My checkBox1");
}

回答8:

Sure, just handle the mousehover event and tell it to display a tool tip. t is a tooltip defined either in the globals or in the constructor using:

ToolTip t = new ToolTip();

then the event handler:

private void control_MouseHover(object sender, EventArgs e)
{
  t.Show("Text", (Control)sender);
}