If you have a toolstrip for navigation, you might want to have buttons on the left and the right, and a label in the centre. There’s no way to stretch the label automatically, but this snippet will resize the label to fill the rest of the ToolStrip. The only requirement is that all of the buttons are the same width.
private void CenteredLabel_Resize() {
int remainingWidth = 144 + btnPrevSkip.Bounds.Left + 2;
lblCenteredLabel.Width = toolStrip1.ClientSize.Width - remainingWidth;
}
You need to replace 144 with the total width of all of the other items on the ToolStrip.
Due to a quirk in the way Windows handles events, once a mouse hover event has been triggered on a windows form control, another event cannot be triggered until the mouse leaves and re-enters the control. Sometimes you might need to process more than one MouseHover event, for example if you have a user control which has draws shapes on itself. As long as you have a record of where the shapes are (by storing them in a collection), you can use the method below as a workaround.
I used this to display a tooltip, so to prevent the MouseHover event being spammed, action is only taken when my tooltip is not visible.
private const uint TME_HOVER = 0x00000001;
private const uint TME_LEAVE = 0x00000002;
private const uint HOVER_DEFAULT = 0xFFFFFFFF;
[DllImport("user32.dll")]
public static extern bool TrackMouseEvent(ref TRACKMOUSEEVENT lpEventTrack);
public struct TRACKMOUSEEVENT {
public uint cbSize;
public uint dwFlags;
public IntPtr hwndTrack;
public uint dwHoverTime;
}
ToolTip toolTip = new ToolTip();
toolTip.Location = new System.Drawing.Point(290, 80);
Rectangle currentActiveShape = new Rectangle(); // the currently active shape (over which the mouse is hovering)
this.MouseMove += delegate(object sender, MouseEventArgs e) {
foreach(Rectangle rect in myShapeCollection) {
if(rect.Contains(e.Location)) {
if(currentActiveDay != day.Bounds) {
toolTip.Hide();
Console.WriteLine("Hide tooltip");
}
currentActiveShape = rect;
// Set location here
Console.WriteLine("Entered " + rect.ToString());
}
}
};
this.MouseHover += delegate(object sender, EventArgs e) {
TRACKMOUSEEVENT trackMouseEvent = new TRACKMOUSEEVENT();
trackMouseEvent.hwndTrack = ((Control)sender).Handle;
trackMouseEvent.dwFlags = TME_HOVER;
trackMouseEvent.dwHoverTime = HOVER_DEFAULT;
trackMouseEvent.cbSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(trackMouseEvent);
TrackMouseEvent(ref trackMouseEvent);
if(!toolTip.Active) {
toolTip.Show();
Console.WriteLine("Show tooltip");
}
};As the mouse moves around the control, the location of the tooltip changes, but it’s not shown until the MouseHover event is triggerd.
Due to a quirk in the way Windows handles events, once a mouse hover event has been triggered on a windows form control, another event cannot be triggered until the mouse leaves and re-enters the control. Sometimes you might need to process more than one MouseHover event, for example if you have a user control which has draws shapes on itself. As long as you have a record of where the shapes are (by storing them in a collection), you can use the method below as a workaround.
This snippet will create a JTextBox and draw an image on the right hand side. It also sets the margin accordingly to prevent the user typing into that area.
JTextField myTextField = new JTextField(20) {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
try {
URL url = this.getClass().getResource("image.png");
final java.awt.image.BufferedImage image = javax.imageio.ImageIO.read(url);
Border border = UIManager.getBorder("TextField.border");
JTextField defaultField = new JTextField();
final int x = getWidth() - border.getBorderInsets(defaultField).right - image.getWidth();
setMargin(new Insets(2, 2, 2, getWidth() - x));
int y = (getHeight() - image.getHeight())/2;
g.drawImage(image, x, y, this);
} catch(Exception ignore) {}
}
};
