How to capture mouse wheel on panel in C#?
I'm using WinForms
EDIT:
I try to do it on PictureBox now.
My code:
this.pictureBox1.MouseClick += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseClick);
this.pictureBox1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseClick);
private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
{
MessageBox.Show("Click");
}
Clicking works. Wheelling doesn't.
Why?
If you can't see the "MouseWheel" event on a component, then you need to create it manually. Also, we need to focus that component, otherwise the "MouseWheel" event will not work for that component. I will show you how to create a "MouseWheel" event for "pictureBox1" and how it works.
INSIDE THE CONSTRUCTOR, create a mousewheel event on that component.
InitializeComponent();
this.pictureBox1.MouseWheel += pictureBox1_MouseWheel;
CREATE THE FUNCTION manually. According to my example, call it "pictureBox1_MouseWheel"
private void pictureBox1_MouseWheel(object sender, MouseEventArgs e)
{
//you can do anything here
}
CREATE a MouseHover event on that component (Go to properties in PicureBox1, select event, locate "MouseHover" and double-click the "MouseHover" event).
CALL "Focus()"; method inside that MouseHover event.
pictureBox1.Focus();
Now run the program.
Windows sends the WM_MOUSEWHEEL message to the control that has the focus. That won't be Panel, it is not a control that can get the focus. As soon as you put a control on the panel, say a button, then the button gets the focus and the message.
The button however has no use for the message, it's got nothing to scroll. Windows notices this and sends the message to the parent. That's the panel, now it will scroll.
You'll find code for a custom panel that can get the focus in this answer.
UPDATE: note that this behavior has changed in Windows 10. The new "Scroll inactive windows when I hover over them" option is turned on by default. The makes the mouse wheel behavior more consistent with the way it works in a browser or, say, an Office program. In this specific case the picturebox now will get the event. Watch out for this.
To wire it up manually...
this.panel1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
private void panel1_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
///process mouse event
}
Easier method is in visual studio click on panel, goto properties viewpanel, select events, locate and double click the "mousewheel" event.
In Winforms, this is achieved using the Control.MouseWheel event
Getting mousewheel events is tricky. The easiest way is using
this.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
instead of
this.panel1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.panel1_MouseWheel);
This way the form gets the event instead of control. This way is easy but has one problem: you can use only one mousewheel event in your form.
If you have more than one control to get mousewheel event the best way is This answer by "Shehan Silva - weltZ"
Related
Is there an event for panel that is equivalent to form event Shown?
I had a few couple of panel switching within a form which will never be closed.
However i couldn't find anything close to an event like Shown which is used in form.
The closes i had is Paint event. However i only wish to update the panel once every time it is shown.
Form.Shown is not raised every time the form is shown, rather it Occurs whenever the form is first displayed. This being said, there is no Panel.Shown event, and no event which is raised "whenever a panel is first displayed".
You can simulate this behavior with the Panel.Paint event, using a flag to keep track of whether it's been "shown" once before. This will make it behave similar to Form.Shown.
private bool panel1Painted = false;
private void panel1_Paint(object sender, PaintEventArgs e)
{
if (!panel1Painted)
{
// do your shown stuff here
panel1Painted = true;
}
}
To keep in the spirit of Form.Shown, you may want to reset the flag if the Panel is reconstructed. This is not the same as shown.
You could listen on the VisibleChanged event and only act on when visibility = true.
https://msdn.microsoft.com/en-us/library/system.windows.forms.panel_events%28v=vs.110%29.aspx?f=255&MSPPError=-2147217396
You could also experiment with the Enter and Invalidated events to see if these give you the results you want.
Or if disabling the panel when leaving it is an option, you might be able to use the EnabledChanged event in your toolbox.
I have a form with only a ReportViewer control on it. When the form is displayed, if you click on the report you can then use the mouse wheel to scroll vertically.
I'd like to be able to scroll as soon as the form appears.
I've tried the following, but no dice...
private void ReportViewer_Load(object sender, EventArgs e)
{
rptViewer.Focus();
}
private void ReportViewer_Activated(object sender, EventArgs e)
{
rptViewer.Focus();
}
Put your code in the form's constructor, right after InitializeComponent();:
rptViewer.Select();
After set rptViewer.Focus call SendKeys.Send(Chr(Keys.Tab)) to move focus from menu to preview area.
Did you try calling rptView.Activate()?
Also it may be that your form is getting focus after the load event completes (I think I've had problems with that before). One solution is, although it is definitely not elegant, to create a single-use Timer that starts when your Load method runs, and fires after 1 ms, and then stops. When the Timer fires, it will activate/focus your ReportViewer.
You could also try adding a MouseWheel event handler to your form. When the event is fired, send a scroll message to your ReportViewer to scroll it up or down. Then it doesn't matter whether or not your ReportViewer has focus, it (should) always scroll when the form has focus.
I developping one win-form application which having one custom control with one label and text box, and placed the custom control in one panel with docksytle as fill,
there is mouse click event for panel and custom control both, but when i click only custom control mouse click event is firing not the panel click event,
so anyone please let me know how to call the panel mouse click event.
Are you sure that you really need to invoke click of parent control? In general it would be, in my opinion, a code smell if you will do something like that - especially when it requires some strange constructions.
If you need to react in a same way when clicking on panel and on any child control inside the panel, it should be enough just to call the same method from two event handlers (that is from event handler of parent panel and event handler of child control. If you need, for example, mouse pointer location inside parent panel, you can easily calculate the position of mouse pointer using, for example, PointToScreen() and PointToClient() methods.
This is not a general solution, but maybe it's what you're looking for:
private void CustomControl_MouseClick(object sender, MouseEventArgs e)
{
panel_MouseClick(sender, e);
}
private void panel_MouseClick(object sender, MouseEventArgs e)
{
}
Create Click Event for each control in panel and invoke the parent :
private void This_Click(object sender, EventArgs e)
{
this.InvokeOnClick(this, null);
}
I'm currently developing a custom control and realize that my code is being run twice. It is not really a huge issue (it is only a Focus method call). However, I would like to understand it.
From reading the MSDN description for click | onclick event, it states that:
Fires when the user clicks the left mouse button on the object.
So I added the OnClick event and the MouseClick events to handle both left and right clicking. But after debugging the code I found that the OnClick handles both left and right click events.
Why is OnClick handling both and do I need to keep both events in my code for some reason I'm overlooking?
protected override void OnClick(EventArgs e)
{
this.Focus();
base.OnClick(e);
}
private void CustomControl_MouseClick(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
rightClickMenu(e);
}
}
According to MSDN, the Click event is called not only when the mouse is clicked, but also when the Enter button is pressed. If you only need to handle mouse clicks, I'd move all of your code in the MouseClick event. You can't do it the other way around because the Click event doesn't tell you which mouse button (if any) was clicked.
First of all, your link is incorrect, it links to HTML and DHTML Reference, not WinForms :)
Correct link is Control.MouseClick event
You need to override only one method. If you want to handle only mouse clicks - override OnMouseClick() and don't handle MouseClick event, otherwise - override OnClick() and don't override OnMouseClick().
You shouldn't need to have both events... Just keep the OnClick.
Also, I haven't done Windows Forms in quite a while, but I think there's a better way to accept focus than manually setting it on the click event, but I can't tell you specifically what it is... I think there's a property for it or something.
In Winforms, the Click event is raised when either mouse key is clicked.
If my memory serves me right, click does both mouseclick and the 'Enter' key or even setting focus on the control using the 'Tab' key and then using 'Space' or 'Enter' to "click" it.
If such behaviour is acceptable/desired, you may do the following.
I had this workaround for a DoubleClick event...
void ControlClick(object sender, EventArgs e)
{
MouseEventArgs mEvt=e as MouseEventArgs; // or (MouseEventArgs)e;
// now mEvt has the same properties as 'e' in MouseClick event
}
Hope this helps.
-Nurchi
The OnClick and CustomControl_MouseClick is the same event
You can have how many methods you want attached to an event ( this.Click += ...)
I'm making a custom control with a panel. I want to be able to drag and drop it so I've implemented that in the MouseDown event of my control. But I want the thing to react when you start drag to give a little feedback to the user. So in the MouseDown even I change the color. Then I want to change it back in the MouseUp event.
My control is not installed into VS2008 but just a class I've written that I instanciate at run time (I don't know in advance how many I need and so on). Now, my control exposes a MouseDown event so as to be able to be dragged. When I subscribe to this event from the parent application to actually perform the drag and drop my control is not repainted on its MouseUp event! In fact, the MouseUp is never invoked. If, on the other hand, I don't subscribe to the event in the parent app it works as intended.
What's going on? Is the parent interrupting the flow so that the MouseUp event never fires in my control? How do I get around this?
I'm not sure if you are using Windows Forms or WPF, but in Windows forms here is what I mean:
public class DerivedPanel : Panel
{
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
Capture = true;
}
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
Capture = false;
// Change your color or whatever here
}
}
In WPF there are two methods, CaptureMouse() and ReleaseMouseCapture() to do the same thing. When the control captures the mouse, it will received mouse events even if the cursor isn't over the control. This could be causing your problem. See MSDN Article
Do you capture the mouse in the custom control on the mousedown event? Try capturing on the mousedown and releasing the capture on the mouseup.