FrameStyle Enumeration
Assembly: System.Windows.Forms (in system.windows.forms.dll)
This enumeration is used by ControlPaint.DrawReversibleFrame.
DrawReversibleFrame is used when selecting objects or during drag-and-drop operations.
The following code example demonstrates using the FrameStyle enumeration. To run the example, paste the following code in a form called Form1 containing several controls.This example assumes the MouseDown, MouseMove, and MouseUp events are connected to the event-handler methods defined in the example.
' The following three methods will draw a rectangle and allow ' the user to use the mouse to resize the rectangle. If the ' rectangle intersects a control's client rectangle, the ' control's color will change. Dim isDrag As Boolean = False Dim theRectangle As New rectangle(New Point(0, 0), New Size(0, 0)) Dim startPoint As Point Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As _ System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseDown ' Set the isDrag variable to true and get the starting point ' by using the PointToScreen method to convert form coordinates to ' screen coordinates. If (e.Button = MouseButtons.Left) Then isDrag = True End If Dim control As Control = CType(sender, Control) ' Calculate the startPoint by using the PointToScreen ' method. startPoint = control.PointToScreen(New Point(e.X, e.Y)) End Sub Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As _ System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseMove ' If the mouse is being dragged, undraw and redraw the rectangle ' as the mouse moves. If (isDrag) Then ' Hide the previous rectangle by calling the DrawReversibleFrame ' method with the same parameters. ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _ FrameStyle.Dashed) ' Calculate the endpoint and dimensions for the new rectangle, ' again using the PointToScreen method. Dim endPoint As Point = Me.PointToScreen(New Point(e.X, e.Y)) Dim width As Integer = endPoint.X - startPoint.X Dim height As Integer = endPoint.Y - startPoint.Y theRectangle = New Rectangle(startPoint.X, startPoint.Y, _ width, height) ' Draw the new rectangle by calling DrawReversibleFrame again. ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _ FrameStyle.Dashed) End If End Sub Private Sub Form1_MouseUp(ByVal sender As Object, ByVal e As _ System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp ' If the MouseUp event occurs, the user is not dragging. isDrag = False ' Draw the rectangle to be evaluated. Set a dashed frame style ' using the FrameStyle enumeration. ControlPaint.DrawReversibleFrame(theRectangle, Me.BackColor, _ FrameStyle.Dashed) ' Find out which controls intersect the rectangle and change their color. ' The method uses the RectangleToScreen method to convert the ' Control's client coordinates to screen coordinates. Dim i As Integer Dim controlRectangle As Rectangle For i = 0 To Controls.Count - 1 controlRectangle = Controls(i).RectangleToScreen _ (Controls(i).ClientRectangle) If controlRectangle.IntersectsWith(theRectangle) Then Controls(i).BackColor = Color.BurlyWood End If Next ' Reset the rectangle. theRectangle = New Rectangle(0, 0, 0, 0) End Sub
// The following three methods will draw a rectangle and allow
// the user to use the mouse to resize the rectangle. If the
// rectangle intersects a control's client rectangle, the
// control's color will change.
private boolean isDrag = false;
private Rectangle theRectangle =
new Rectangle(new Point(0, 0), new Size(0, 0));
private Point startPoint;
private void Form1_MouseDown(Object sender,
System.Windows.Forms.MouseEventArgs e)
{
// Set the isDrag variable to true and get the starting point
// by using the PointToScreen method to convert form
// coordinates to screen coordinates.
if (e.get_Button().Equals(MouseButtons.Left)) {
isDrag = true;
}
Control control = (Control)sender;
// Calculate the startPoint by using the PointToScreen
// method.
startPoint = control.PointToScreen(new Point(e.get_X(), e.get_Y()));
} //Form1_MouseDown
private void Form1_MouseMove(Object sender,
System.Windows.Forms.MouseEventArgs e)
{
// If the mouse is being dragged,
// undraw and redraw the rectangle as the mouse moves.
if (isDrag) {
// Hide the previous rectangle by calling the
// DrawReversibleFrame method with the same parameters.
ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
FrameStyle.Dashed);
// Calculate the endpoint and dimensions for the new
// rectangle, again using the PointToScreen method.
Point endPoint = this.PointToScreen(new Point(e.get_X(), e.get_Y()));
int width = endPoint.get_X() - startPoint.get_X();
int height = endPoint.get_Y() - startPoint.get_Y();
theRectangle = new Rectangle(startPoint.get_X(), startPoint.get_Y(),
width, height);
// Draw the new rectangle by calling DrawReversibleFrame
// again.
ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
FrameStyle.Dashed);
}
} //Form1_MouseMove
private void Form1_MouseUp(Object sender,
System.Windows.Forms.MouseEventArgs e)
{
// If the MouseUp event occurs, the user is not dragging.
isDrag = false;
// Draw the rectangle to be evaluated. Set a dashed frame style
// using the FrameStyle enumeration.
ControlPaint.DrawReversibleFrame(theRectangle, this.get_BackColor(),
FrameStyle.Dashed);
// Find out which controls intersect the rectangle and
// change their color. The method uses the RectangleToScreen
// method to convert the Control's client coordinates
// to screen coordinates.
Rectangle controlRectangle;
for (int i = 0; i < get_Controls().get_Count(); i++) {
controlRectangle =
get_Controls().get_Item(i).RectangleToScreen(get_Controls().
get_Item(i).get_ClientRectangle());
if (controlRectangle.IntersectsWith(theRectangle)) {
get_Controls().get_Item(i).set_BackColor(Color.get_BurlyWood());
}
}
// Reset the rectangle.
theRectangle = new Rectangle(0, 0, 0, 0);
} //Form1_MouseUp
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.