In a page one image control is there.when click on that i am showing big image.in some condition i don't want to show.For that i am trying to remove click handler event.please tell me how to remove image mouse enter click event in wp.
You can remove a event handler from a event by using the -= operator.
Example for removing a event handler called OnTap_Handler from the Tap event of a Image.
Image.Tap -= OnTap_Handler;
Related
I have a Vaadin 23 application where I have a Div element with a Button in it (among other content) and a click listener added to it, as well as to the button:
Button button = new Button();
button.addClickListener(event -> { ... });
Div wrapper = new Div(button);
wrapper.addClickListener(event -> { ... });
The problem is that both listeners are firing when the button is clicked.
How can I make sure that only the button click listener is fired in that case? I want the click listener on the Div to fire when I click anywhere inside the Div except on the button.
Alternatively, if I could detect in the click listener on the Div that the click was actually on the button, I could simply ignore it. But I don't see how to do that either.
This is a port from a Vaadin 8 app where it was working correctly. The wrapper Div in that case was a CssLayout with a LayoutClickListener added.
There is a highly voted issue for adding this feature to Vaadin Flow. Different workarounds are also described in the issue.
In your case, I think the workaround would look like this:
button.getElement().addEventListener("click", ignore -> {}).addEventData("event.stopPropagation()");
With vaadin 23.1.x you can set a itemClickHandler when a user click on a item/row in the grid with myGrid.addItemClickListener(..)
This works fine.
But if you have a component column, with a button in it, then the ClickEvent of the Button is fired and also the itemClickListener of the grid row.
Is there a way to prevent the button click from also triggering the itemClickListener?
You must use this method to add the listener them you can
myGrid.getElement().addEventListener("item-click",
event -> ...)
.addEventData("event.stopPropagation()");
I'm not 100% sure if the even is item-click or just click.
I'm writing a small pyqt program. I want the main window to to react to arrow movement. I added an event to my MainGui class, keyPressEvent, that handle this. The event work fine as long as I don't press certain buttons such as Key_Up or Key_Down are directed to my (currently only) QComboBox and not to my mainGui. I tried to give the focus to mainGui after each paintEvent but then I need to double click on buttons/comboBox.
Then I tried to use the MousePressEvent to check if a certain element is under the mouse. This work fine with the comboBox, but not with the button.
So, how can I direct key events to the mainGui or give the focus to QButtons?
I used eventFilter to identify when the mouse enter the QPushButton and give it focus:
def eventFilter(self,source,event):
if event.type() == QtCore.QEvent.HoverMove:
if self.execButton.underMouse():
self.execButton.setFocus()
self.keepFocus=False
else :
self.keepFocus=True
keepFocus is a flag I initialized in the __init__ function of the class. I added this part at the paintEvent function
if self.keepFocus:
self.setFocus()
else:
self.keepFocus = True
Now, I keep the focus at the MainGui and I only give it to the button when the mouse hove over it. If I do another action (like pressing a mouse button or a keyboard key) the focus is given back to the MainGui. This will create some buggy filling (For example, I need to press twice a keyboard key before the first response) but this is workable.
I'm trying to build an editing view for a mobile app powered by Backbone.js and Trigger.io. The user goes to a note view and makes changes by tapping "edit" in the top right. When the "edit" button is tapped, we focus on the textarea containing the content and the "edit" button goes away and a "save" button appears. Whenever "edit" is tapped, however, a mouseUp event is firing which results in the textarea losing focus.
The mouseUp event does not fire if the edit button gets hidden and nothing replaces it. The mouseUp does fire if the edit button either A) remains or B) is hidden and save button replaces it.
The only way I've found to fix it is by setting a 200ms+ timeout between hiding the "edit" button and displaying the "save" button.
Is there something with mouseup events firing after click events and/or having them target separate elements? I'd post code but it's all over the place and would not provide much context. If you really need the code, I can post it in parts.
I believe iOs places a delay on the mouseup, to determine if a long touch is being performed. This might help:
http://cubiq.org/remove-onclick-delay-on-webkit-for-iphone
I have a heavily modified control based on TStringGrid. I want to allow the user to make selections in this grid but restrict the selection one single row (the current row).
Implementation:
When the user presses the left mouse button I am using a dirty hack: On OnMouseDown event I capture the mouse cursor and keep it on the current row. The user can move the mouse device up and down on its pad but the cursor will not go up or down. It will stay on the current row. When the user releases the button (OnMouseUp event), I release the capture.
However, this hack is as I said very dirty. There are several problems. For example, if the user presses the left mouse button (LMB) and then without releasing that button it presses the right button, the associated pop-up menu will pop but the mouse capture will never be released. So, the mouse will be locked in a screen region until the user will has the brilliant idea to click the LMB one more time to unlock the mouse. This may be a bug in D7. There is a separate post about it here: TStringGrid - OnMouseUp is not called!
There is a elegant way to do this?
Edit:
OnSelectCell is not working. OnSelectCell event is called only once when you click the cell. If you keep the button pressed and move the mouse to expand the selection, OnSelectCell will not be called again.
Indeed MoveCurrent appears only in TCustomGrid.MouseDown.
Use the OnSelectCell event and set the CanSelect var parameter depending on whether the ARow parameter is what you want.
A nice solution
Check the options property on TStringGrid
There is an Option called 'goRangeSelect'
Set this to false using the object inspector
Or programatically this can be done by
StringGrid1.Options - [goRangeSelect];
This answer is not elegant at all, but it works.
My solution is NOT to use the PopupMenu property of the StringGrid. Instead I implemented my own PopUpMenu property. Works almost perfect. There is on small problem, the bottom of the pop-up menu appears next to the cursor and not its top.