Is it possible to check for a right-click on a menu item in .NET?
It appears that the framework doesn't expose it as an Event, but I've seen other applications (like Chrome and Firefox) which allow you to bring up a right-click context menu for a menu item. Presumably with a little event-loop magic you can do the same thing in .NET, right?
EDIT: I'm talking about desktop application programming, not ASP.NET.
It is an unnatural act. Menus are designed to automatically pop down when they lose the focus. The context menu will take the focus, end of menu. MenuStrip will fight you tooth and nail, I haven't seen it done.
In Winforms I'm unsure, I don't think so, the Click event is a generic EventHandler
In WPF, You can, the OnClick Event passes in a System.Windows.Input.MouseEventArgs object, which has properties on it like .MiddleButton .RightButton
For ASP.NET You need to use javascript to catch the right-click and submit a secret form, initiate a post-back, or use AJAX.
This isn't exactly what was asked for but is a decent compromise and isn't too big a stretch from the UI standards viewpoint.
WinForms menus don't seem to even respond to right clicks so use the presence/absence of the shift key being pressed instead.
private void MenuClick(object sender, EventArgs args)
{
if ((Control.ModifierKeys & Keys.Shift) == Keys.Shift) DoSpecialStuff();
else DoNormalStuff();
}
In Click event you can detect right mouse click with:
Control.MouseButtons == MouseButtons.Right;
Though you might want to check this also in Closing event so to prevent Close event from being raised.
Related
I am making a Windows Form Application.
I have two buttons (Accept and Cancel) and I want to call the click event for one when Enter is pressed, and the click event for the other when Escape is pressed.
This is a code I've tried (I found it here on a similar question) that didn't work.
protected override void OnKeyDown(KeyEventArgs e)
{
if (e.KeyCode.Equals(Keys.Enter)) {
this.btnOrder.PerformClick();
}
if (e.KeyCode.Equals(Keys.Escape))
{
this.btnCancel.PerformClick();
}
}
I have looked through all the properties and events of the buttons but I cannot find anything Accept or Cancel related. I know that this is probably way too easy but I've learnt of these buttons tonight and I just can't do them.
Can someone tell me what am I doing wrong?
It's a property of the Form:
AcceptButton
CancelButton
In the Form Designer: You add the buttons to the form, select the form, and select the buttons you want as accept and/or cancel button.
I am relatively new to C#. I have a window with buttons. If the window is out of focus and I click on a button the first time, the first click grabs focus for the window and all subsequent clicks will perform their respective actions.
Is there a way to execute the event associated with the button instead of grabbing focus?
It sounds like you are describing how ToolStrips operate, which does not fire a click event unless the application has the focus.
A work around is to use your own ToolStrip and let the mouse activation give the control the focus, which in turn will then let the button fire it's click event:
public class ToolStripIgnoreFocus : ToolStrip {
private const int WM_MOUSEACTIVATE = 0x21;
protected override void WndProc(ref Message m) {
if (m.Msg == WM_MOUSEACTIVATE && this.CanFocus && !this.Focused)
this.Focus();
base.WndProc(ref m);
}
}
Rebuild your solution and you should see a ToolStripIgnoreFocus control available in your tool box. Try adding that to your form and then add your tool buttons accordingly.
This is how most Windows apps work - the app needs to have focus before it can receive click events.
As far as I know, you've described an inherent Windows behaviour and as such it could be impossible to do.
An alternative is to harness 'Always on top' style of windows app which is explained here:
How to make a window always stay on top in .Net?
This is normal windows behavior. Something that I don't think you can override (so that the click event fires, but doesn't bring your app to the foreground, and active state).
If you don't want to bring focus to the window, but still want to provide some 'interaction' with the window itself, try keyboard hooks or hotkey events. Examples:
http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvb/thread/2622427d-1e15-4f30-b01d-57b0ba054f5c
Using global keyboard hook (WH_KEYBOARD_LL) in WPF / C#
Low-level Keyhook
http://www.pinvoke.net/default.aspx/user32/RegisterHotKey.html
I am having a strange problem with the .NET TabControl in C# (Visual Studio 2010). Start a Windows Forms Application. Add a tab control and a button. Add two different labels to the two tab pages so you can differentiate them. The purpose of the button is just to act as a next button; subscribe to the its Click event with the code:
tabControl1.SelectTab(1);
Let's assume the user entered something wrong on the first tab, so when they try to go to the second tab we want to send them back, so subscribe to the tab control's SelectedIndexChanged event with the code:
if(tabControl1.SelectedIndex == 1)
{
tabControl1.SelectTab(0);
}
Now run the program and click the button. You will notice that as judged by the highlighted tab at the top, the first tab page is the one that appears to be selected, as you'd expect. However, as judged by the tab page that actually appears in the body of the tab control, it's still the second tab page that shows up! Calls to various controls' Focus(), Update(), and Refresh() functions don't seem to help. What is going on here?
I repro. This is a generic problem with event handlers, you can confuse the stuffing out the native Windows control by jerking the floor mat like that. TreeView is another control that's very prone to this kind of trouble.
There's an elegant and general solution for a problem like this, you can use Control.BeginInvoke() to delay the command. It will execute later after the native control is done with the event generation and all side-effects have been completed. Which solves this problem as well, like this:
private void tabControl1_SelectedIndexChanged(object sender, EventArgs e) {
if (tabControl1.SelectedIndex == 1) {
this.BeginInvoke(new Action(() => tabControl1.SelectTab(0)));
}
}
I'm using NotifyIcon (System tray icon) in my WinForms application. I also have a ContextMenuStrip assigned to it. When user right clicks on NotifyIcon this ContextMenuStrip pops up.
These are the only events that NotifyIcon has.
Click
DoubleClick
MouseClick
MouseDoubleClick
MouseDown
MouseMove
MouseUp
This contextMenuStrip items (ToolStripMenuItem) are dynamically generated. I mean there are few default items like 'About','Exit','Help' etc.. but other items are dynamically generated and inserted into this menu when user right clicks on it. I'm generating items and inserting into contextMenuStrip in Click event handler
Now, I've two problems:
Problem is for an instant its showing the default menustrip and then my Click event handler executes and new update menu pops up. How can I avoid this? I don't want to see the default menu at all. In other words I need to override the default behavior.
Other problem is since I'm handling the Click event (because I didn't find RightClick event) the left button click also is handled by the same handler. I want to do different things (like show application windows) on left click and show dynamically generated contextMenuStrip on right click. How to acheive this?
Why are there two different events like Click & MouseClick? What else would we click with? Aren't these two interdependent. I mean when ever there is a MouseClick there is also a Click.
If you can point me to some examples. That would be great!
Item #1) The ContextMenuStrip has events that allows you to handle any dynamic creation of menu items before the menu is displayed. See the Opening and Opened events.
Item #2) Use the MouseEventArgs parameter to inspect the mouse-state when event was raised.
Item #3) Depending on the control, Click and MouseClick can be different. Take buttons for instance. When a button has focus, the "Click" event is raised when the user presses the Space or Enter key. In most cases, a MouseClick generates a Click event.
I'm the OP. I guess I've achieved it.
notifyIcon.MouseDown += new MouseEventHandler(notifyIcon_MouseDown);
and
static void notifyIcon_MouseDown(object sender, MouseEventArgs e)
{
NotifyIcon notifyIcon = sender as NotifyIcon;
if (e.Button == MouseButtons.Left)
{
MessageBox.Show("Left Button Clicked"); // & do what ever you want
}
else
{
updateMenuItems(notifyIcon.ContextMenuStrip);
}
}
I am writing an app where the user should be able to alter the action of a button.
The user should right-click a button, and choose an option from a pop-up context menu. Once the choice has been made the button will perform a different action when the user uses a normal click.
I've already gotten the "Click" event working for a normal button click, however the "MouseClick" event handler isn't working correctly.
The "MouseClick" event gets activated on regular left-clicks, but never get's called for right-click.
Is there some default event handling being performed that is ignoring that right-click?
I'm sorry to say that this would be a serious UI blooper. Perhaps it would make more sense to add a small combobox next to the button.
Perhaps something like this?
http://www.codeproject.com/KB/buttons/SplitButton.aspx
If you want to display a context menu with actions to choose from it should be enough to assign a ContextMenuStrip to the ContextMenuStrip property. There is usually no need to manually handle the mouse events for that.
surely it would be better to implement it on the MouseDown event rather than the MouseUp event. i dont understand how this is much different from MouseClick event
edit: Just tried this and it works a treat :)
In Button (and certain other controls), the MouseClick event is only fired for the left button. Refer to MSDN.
If you want to know about the right button, respond to the MouseUp event--though as other posters have pointed out, this isn't a great UI idiom.
Use the Mouse UP event... test that Button.X and Button.Y are within the size of the button otherwise you have moved the mouse away from the button.
Terry G