I have two FlowLayoutPanels on a form: PanelA and PanelB. Each will be populated at run-time with multiple controls, such that the panel will scroll (i.e AutoScroll is true).
Here's the issue: The controls that the panels are populated with each contain a ComboBox. Thus, MouseWheel events are consumed by the combo box instead of by the panel. I want MouseWheel events to be consumed by the panel.
If there's no scrollable control on the child controls, then the MouseWheel event skips the child control (which doesn't handle it) and hits the panel, which does handle it. How can I set my child control's combo box to ignore the MouseWheel event? Can I tell it to re-raise the event?
I tried just applying Focus to the Parent whenever one of the child controls ticks the 'MouseEnter' event; this fixed the scrolling issues, but also left the child controls completely un-editable.
Something else I've found from digging around involves fiddling with the Windows API directly, but I find it hard to believe that something like that is required for this.
I tested the following code and it seems like a solution to your issue. Basically you need to focus the 'FlowLayoutPanel' when you click on it, or your mouse enters it:
private void newCheckListQuestionPanel_Click(object sender, EventArgs e)
{
newCheckListQuestionPanel.Focus(); //allows the mouse wheel to work after the panel is clicked
}
private void newCheckListQuestionPanel_MouseEnter(object sender, EventArgs e)
{
newCheckListQuestionPanel.Focus(); //allows the mouse wheel to work after the panel has had the mouse move over it
}
Source
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I have a user control that I'm trying to make draggable. The whole control should be draggable except when you click on buttons or text boxes. I'm handling the mousedown, mouseup and mousemove events on the usercontrol itself and I can drag by clicking anywhere. The only issue is now I can't click any buttons on the user control. Any clue what's going on?
Code is something like this:
<UserControl PreviewMouseLeftButtonDown="Popup_PreviewMouseLeftButtonDown" ....STUFF...>
<!-- CAN'T CLICK THIS -->
<Button />
<UserControl>
Code Behind:
public void Popup_PreviewMouseLeftButtonDown(object sender, MouseEventArgs e)
{
mouseDown = true;
oldMousePosition = this.PointToScreen(e.GetPosition(this));
this.Popup.Child.CaptureMouse();
}
The issue arises when you use CaptureMouse() - this permanently captures all your mouse input on the window, and makes it so that you're unable to click on anything within the Window. I don't know if it's different for you, or if you checked, but it's not (just) that the Button is unclickable - it's that literally everything on the Window is unclickable.
You have to actually do something with the mouse after you've captured it, and then once you finish that, you have to return normal control by calling Mouse.Capture(null). For you, this would probably be best to do in your MouseUp() method.
However, this still leaves the child problem. I can't really think of any way you're going to be able to both capture all mouse click events on a parent control and allow them to get to the child control. I suppose you could check the mouse position against the button position, both relative to the UserControl, then route the click event to the Button every time, but this seems a little overelaborate. Is there a reason you can't just add a full-sized Grid to the UserControl with a lower ZIndex than the Button, and just use that to detect if a click was made inside the UserControl but not on the Button?
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 am using visual studio. In my program I have the option for a user to activate certain widgets that they want to have. Each widget is a UserControl, so when they click to show a widget, it is activating the corresponding user control. Once they activate the control, they can drag the boxes wherever they wish so that they can customize how their screen looks. However, whenever you drag one widget over another, it just stacks them on top of each other, and this is not what I want. If I am dragging a box and it touches another one, I want it to stop and not be able to overlap it. How can I do this? I suspect it has something to do with the "DragOver" event, but not for sure.
The DragOver event will be raised on these case :
[+] If the user moves out of a window, the DragLeave event is raised.
[+] If the mouse enters another control, the DragEnter for that control is raised.
[+]If the mouse moves but stays within the same control, the DragOver event is raised.
If this is the event that you want, so try to terminate the widget (User Control) on UserControl_DragOver.
You can terminate your UserControl like this :
private void Btn_Cancel_Click(object sender, EventArgs e)
{
this.Parent.Controls.Remove(this);
}
(If you mean sth else, tell in comment)
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);
}
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"