I am new to c# Windows Form Application Development.
I created a form with a panel in which the user can draw image on it. How do I check if the image is clicked?
In designer mode, right-click on the panel, go to Properties.
In the Properties window, choose EVENTS (Lightning icon).
Double click on Click, then this code will be generated:
private void panel1_Click(object sender, EventArgs e)
{
//--what to do when user clicks on panel--
MessageBox.Show("Clicked");
}
Just double-click on the form's image-panel (or whatever object you wish to detect click events on) and Visual Studio will automatically generate a OnClick() event. Needless to say, I'm talking about the forms designer, not the actual form you will see when testing your code.
Alternatively, you can set which events you want to implement through the object's properties. That way you can also implement OnKeyDown() or OnFocus() or any other kind of events.
Edit: If the image doesn't cover the entire panel, you'll have to check if the mouse position is within the image's dimension. Assuming the image is drawn at position (imgOriginX, imgOriginY) and has the size (imgWidth, imgHeight):
// Fires, when user clicks on panel
private void panel_Click(object sender, EventArgs e)
{
// Cast to MouseEventArgs
MouseEventArgs mouse = (MouseEventArgs)e;
// If mouse is within image
if (mouse.X >= imgOriginX && mouse.Y >= imgOriginY && mouse.X < imgOriginX + imgWidth && mouse.Y < imgOriginY + imgHeight)
{
// do something here
}
}
Related
I am trying to write a program to manage tasks from my team. For this I use drag&drop capable custom UserControls. I try the following: When the UserControl is dragged over a slot, the control should then snapped into the slot. The problem seems to be that the slot does not get the events like "MouseEnter" or "DragEnter". Does anyone know a workaround, or is it possible to pass events down?
I think I just need a little push in the right direction.
Edit:
Main functionality:
The user control, let's call it task, should be docked into a slot when released over it.
A slot consists of properties and a panel. The task should appear in the panel.
Bonus:
A task, should dock into the different slots while dragging. So that it is always visible where the 'task' is placed when it is released.
I hope this shows what I am trying to do.
Edit 2
To clarification: I use the "MouseDown", "MouseUp" and "MouseMove" for the drag an drop.
Here you can see my Example the blueish panel is my task. The white the slot it should snap to.
On the second picture I drag the Task over the Slot panel. The mouse is not visable here but it's right beside the "K" of task.
i have added for testing the following code. Which should color the panel inside the slot in a color if an event is raised. But the color stays white.
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
this.panel1.BackColor = Color.Black;
}
private void panel1_MouseEnter(object sender, EventArgs e)
{
this.panel1.BackColor = Color.Green;
}
private void panel1_DragEnter(object sender, DragEventArgs e)
{
this.panel1.BackColor = Color.Yellow;
}
private void panel1_DragDrop(object sender, DragEventArgs e)
{
this.panel1.BackColor = Color.Violet;
}
Why I don't get events on the Slotpanel?
I hope that this helps to understand my problem.
I'm trying to create a graph editor using WinForms.
I have a picture box, whenever I click on it the program draws a vertex by creating a label about 15px in size where I store a string, the location, etc.
I can draw the edges by drawing lines from location to location, but I need other boxes to do this, I wonder if there is a way to do this purely by touch (with the mouse cursor).
I need some kind of object that if clicked will start an event that will draw an edge up to the vertex I click next. I considered adding little picture boxes instead of labels, but the labels are convenient for storing the name of the vertexes, also I think adding both a label and an other box in the same position may hide one of the objects.
You can get the x and y coordinate's of the mouse on a user controls click event.
I would store the coordinate's of the last point you clicked on outside of the mouse click event and then draw a line from the last point to the new point.
lastPoint = null;
private void userControl_MouseClick(object sender, MouseEventArgs e) {
if (e.Button == MouseButtons.Left)
{
Point newPoint = e.Location;
if(lastPoint != null)
{
drawLine(lastPoint, newPoint);
}
lastPoint = newPoint;
}
}
Hope this helps.
I got a picture box that got an original image in my program. When i hover with my mouse over it it changes picture to another picture and when i leave it changes back.
But..
There is such a delay to change to the right picture if i hover over it or not. It takes like 1 second before it changes, What should i change to improve the speed of the change? This is the code i am using at the moment:
private void pictureBox1_MouseHover(object sender, EventArgs e)
{
pictureBox1.Image = ABC_Bok.Properties.Resources.BokVänsterhörn_1;
}
private void pictureBox1_MouseLeave(object sender, EventArgs e)
{
pictureBox1.Image = ABC_Bok.Properties.Resources.BokVänsterhörnet;
}
This is the third time today that I've seen this issue. MouseHover is raised when the mouse pointer STOPS OVER a control. If you want something to happen as soon as the mouse pointer goes over the control then you want MouseEnter, just as you're using MouseLeave for the change back again.
I have WebBrowser class and image loaded in it. After mouse click on the browser, I need to get mouse position - what is the best way to do it?
this is actually pretty simple if your just looking for the screen coordinates.
// this probably should be in your form initialization
this.MouseClick += new MouseEventHandler(MouseClickEvent);
void MouseClickEvent(object sender, MouseEventArgs e)
{
// do whatever you need with e.Location
}
if your strictly looking for the point in the browser, you need to consider the functions
browser.PointToClient();
browser.PointToScreen();
I'm trying to write a simple text editor like DarkRoom with just a RichTextBox (or alternatively a TextBox) in it. My problem is that I can't use the mouse wheel for scrolling unless I have a vertical scrollbar. Is there any way to hide this scrollbar and still be able to scroll with the mouse wheel?
So far I have several ideas how this could be done, but no idea how to implement them.
re-create the scrolling code using a MouseWheel event
change the visual style of the scrollbar to hide it or make it less visible
write my own TextBox widget
overlap the scrollbars with something else to hide them
P.S.: Using any win32 stuff is not an option.
Yes, you will have to capture the .MouseWheel and .MouseMove events. See this post.
Ok, do something like following:
Add a line in form load event.
private void Form1_Load(object sender, EventArgs e)
{
this.richTextBox1.MouseWheel += new MouseEventHandler(richTextBox1_MouseWheel);
}
Add following in mouse wheel event.
void richTextBox1_MouseWheel(object sender, MouseEventArgs e)
{
if (e.Delta > 0)
{
//Handle mouse move upwards
if (richTextBox1.SelectionStart > 10)
{
richTextBox1.SelectionStart -= 10;
richTextBox1.ScrollToCaret();
}
}
else
{
//Mouse move downwards.
richTextBox1.SelectionStart += 10;
richTextBox1.ScrollToCaret();
}
}
Let me know in either cases, if you would want the running sample of the same; or if you are not liking the solution (0: