I have a little problem with my application.
-
Hello, i have a little problem with my application. I'll try to describe as simple and organised as I can. Objective: I have two user controls in my main form. I've linked them with a simple line that updates (refresh the form) when one of the user controls was moved. I want the user of my application to move (with the mouse) one of the user controls, that I've created, in the main form. The user controls are added directly to the main form like this:
this.Control.Add(uc1);. Problem: The problem is when the user move one of the user controls. The refresh/redraw of the form loses the line partialy or absolute. Sometimes the line is visible, sometimes it isn't. I have NO PROBLEM with the algorithm. It's a simple 2D line. I draw the line in the Paint event of the main form. Observations: 1. I've tryed to draw on a panel, the result was the same. 2. I've tryed setting the DoubleBuffered property to TRUE, the result was the same. 3. I've observe that pictureBox control donsen't have this problem. I've tested with a simple "line tracking the mouse" application and seen that there is no problem when redrawing. So my next question was: - Can I draw/use/add an user control on a pictureBox control? or a better way to draw GDI+ on Windows Forms to get rid of this redrawing problem? I've tryed to add the user controls in the pictureBox control but they didn't appear. Thank you!Alex M.
-
Hello, i have a little problem with my application. I'll try to describe as simple and organised as I can. Objective: I have two user controls in my main form. I've linked them with a simple line that updates (refresh the form) when one of the user controls was moved. I want the user of my application to move (with the mouse) one of the user controls, that I've created, in the main form. The user controls are added directly to the main form like this:
this.Control.Add(uc1);. Problem: The problem is when the user move one of the user controls. The refresh/redraw of the form loses the line partialy or absolute. Sometimes the line is visible, sometimes it isn't. I have NO PROBLEM with the algorithm. It's a simple 2D line. I draw the line in the Paint event of the main form. Observations: 1. I've tryed to draw on a panel, the result was the same. 2. I've tryed setting the DoubleBuffered property to TRUE, the result was the same. 3. I've observe that pictureBox control donsen't have this problem. I've tested with a simple "line tracking the mouse" application and seen that there is no problem when redrawing. So my next question was: - Can I draw/use/add an user control on a pictureBox control? or a better way to draw GDI+ on Windows Forms to get rid of this redrawing problem? I've tryed to add the user controls in the pictureBox control but they didn't appear. Thank you!Alex M.
Try adding
Control.Parent.Invalidate()when you move your control. That way the line should be re-drawn. You can't add the controls to a PictureBox - it isn't a container and doesn't know what to do with them.You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy
-
Try adding
Control.Parent.Invalidate()when you move your control. That way the line should be re-drawn. You can't add the controls to a PictureBox - it isn't a container and doesn't know what to do with them.You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy
Thank you for you're quick reply! :) I've read about pictureBox and see that isn't a container. So it was a foolish from me to try adding a user control to a pictureBox control. I've tryed to Refresh()/Invalidate() + Update() method(s) when I move one of the user control, but the result is still the same. To be more clear, see my code:
DesenTabel t1, t2;
private void AddUserControls()
{
t1 = new DesenTabel();
t2 = new DesenTabel();this.Controls.Add(t1);
this.Controls.Add(t2);
}private void Form_Paint(object sender, PaintEventArgs e)
{
// here I draw the line
e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black)), t1.Location, t2.Location);
}private void t1_Move(object sender, EventArgs e)
{
// this.Refresh() is equivalent to:this.Invalidate();
this.Update();
}private void t2_Move(object sender, EventArgs e)
{
// this.Refresh() is equivalent to:this.Invalidate();
this.Update();
}The line isn't drawing well. It intrerupts on the way of linking the two tables because of the redraw! How can I get rid of this problem ? Thank you!
Alex M.
-
Try adding
Control.Parent.Invalidate()when you move your control. That way the line should be re-drawn. You can't add the controls to a PictureBox - it isn't a container and doesn't know what to do with them.You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy
Usually, it makes more sense to create a line control. or use VisualBasic PowerPack to add a LineShape. Or the best of all, draw all on a canvas. What OriginalGriff suggested will work but will have too much flickering. Also, the line will only be drawn when you have finished moving the control. Atleast my experience has been troublesome so far.
-
Thank you for you're quick reply! :) I've read about pictureBox and see that isn't a container. So it was a foolish from me to try adding a user control to a pictureBox control. I've tryed to Refresh()/Invalidate() + Update() method(s) when I move one of the user control, but the result is still the same. To be more clear, see my code:
DesenTabel t1, t2;
private void AddUserControls()
{
t1 = new DesenTabel();
t2 = new DesenTabel();this.Controls.Add(t1);
this.Controls.Add(t2);
}private void Form_Paint(object sender, PaintEventArgs e)
{
// here I draw the line
e.Graphics.DrawLine(new Pen(new SolidBrush(Color.Black)), t1.Location, t2.Location);
}private void t1_Move(object sender, EventArgs e)
{
// this.Refresh() is equivalent to:this.Invalidate();
this.Update();
}private void t2_Move(object sender, EventArgs e)
{
// this.Refresh() is equivalent to:this.Invalidate();
this.Update();
}The line isn't drawing well. It intrerupts on the way of linking the two tables because of the redraw! How can I get rid of this problem ? Thank you!
Alex M.
private void AddUserControls()
{
t1 = new DesenTabel();
t2 = new DesenTabel();this.Controls.Add(t1);
this.Controls.Add(t2);
}Is your problem: add
t1.Move += new EventHandler(node_Move);
t2.Move += new EventHandler(node_Move);
...
void node_Move(object sender, EventArgs e)
{
Invalidate();
}to tie the Move event to the handlers...
You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy
-
private void AddUserControls()
{
t1 = new DesenTabel();
t2 = new DesenTabel();this.Controls.Add(t1);
this.Controls.Add(t2);
}Is your problem: add
t1.Move += new EventHandler(node_Move);
t2.Move += new EventHandler(node_Move);
...
void node_Move(object sender, EventArgs e)
{
Invalidate();
}to tie the Move event to the handlers...
You should never use standby on an elephant. It always crashes when you lift the ears. - Mark Wallace C/C++ (I dont see a huge difference between them, and the 'benefits' of C++ are questionable, who needs inheritance when you have copy and paste) - fat_boy
I've debugged my application and the events are working fine. The move event for re-drawing is triggered. I've modifyed and simplyfied the AddUserControls method to be more clear to you. The events exists! My mistake for not showing that. Probably I need to make a canvas to add custom shapes and controls on it, but I still hope this isn't the answer :) Thank you!
-
Usually, it makes more sense to create a line control. or use VisualBasic PowerPack to add a LineShape. Or the best of all, draw all on a canvas. What OriginalGriff suggested will work but will have too much flickering. Also, the line will only be drawn when you have finished moving the control. Atleast my experience has been troublesome so far.
Hi, i'll try drawing all to a canvas, in order to make all go nice and well. I'll bring back news! Cheer's!
Alex M.
-
Hi, i'll try drawing all to a canvas, in order to make all go nice and well. I'll bring back news! Cheer's!
Alex M.
Alex Manolescu wrote:
I'll bring back news!
All the best.
