mouseclick-event | 易学教程

How to tell the mouse button using QApplication::mouseButtons() in a “click” slot?

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问题 I have a QMainWindow, and want to handle the "clicked" signal from a smaller widget (such as tableview) inside it. Originally I connect the signal to a slot of this QMainWindow, this is the most common approach. Now I need to tell which mouse button is clicked, and do different things for left and right button, I found that the "clicked" signal don't have the mouse event information. I tried to implement the "mousePressEvent" function,but there are still some problem. if the mouse action is

Why can't I click() links in jQuery?

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问题 I came across a curiosity in jQuery: if I call .click() on a link the click event handlers are called, but the link isn't actually followed (as if it were clicked in the browser): <a id="link" href="http://www.google.com>Link</a> $("#link").click() // won't take me to Google But in plain Javascript, everything behaves as expected: document.getElementById("link").click() // *will* take me to Google This is apparently intentional behaviour - but I'm struggling to work out why click was

Click in Canvas is three pixels off

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问题 I've spent the whole day trying to get a click over my canvas to return the pixel xy offset. What a mission this has been! This is what I've ended up with: <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>JS Bin</title> </head> <body> <script src="https://code.jquery.com/jquery-1.10.2.js"></script> <div id="logX">x</div> <div id="logY">y</div> <div style="margin-left:100px"> <div style="margin-left:100px"> <canvas id="myCanvas" width="100" height="1000" style="border:20px solid

option & jQuery .click() won't work together

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问题 this works great in FF but not in IE, Chrome or Safari. $('#countryDropDown option').click(function() { var countryID = $(this).val(); dostuff(); }); // countryDropDown = id of select So, as you can see I want to attach a click event to each option. I alos tried var allOpts = $('#countryDropDown option'), l = allOpts.length, i = 0; for (i = 0; i < l; i += 1) { $(allOpts[i]).click(function() { var countryID = $(this).val(); doStuff(); }); } It still does not want to work in any other browser

NSTableView: detecting a mouse click together with the row and column

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问题 I'm trying to detect when a mouse click occurs in an NSTableView, and when it does, to determine the row and column of the cell that was clicked. So far I've tried to use NSTableViewSelectionDidChangeNotification, but there are two problems: It only triggers when the selection changes, whereas I want every mouse click, even if it is on the currently selected row. The clickedRow and clickedColumn properties of NSTableView are both -1 when my delegate is called. Is there a better (and correct)

How to rewrite this DataGrid MouseLeftButtonUp binding to MVVM?

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问题 I have a working MouseLeftButtonUp binding that I works from the View.cs but that I cannot get working from the Viewmodel.cs XAML: <DataGrid x:Name="PersonDataGrid" AutoGenerateColumns="False" SelectionMode="Single" SelectionUnit ="FullRow" ItemsSource="{Binding Person}" SelectedItem="{Binding SelectedPerson}" MouseLeftButtonUp="{Binding PersonDataGrid_CellClicked}" > View.cs: private void PersonDataGrid_CellClicked(object sender, MouseButtonEventArgs e) { if (SelectedPerson == null) return;

Angular Material md-select load options in async way

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问题 I need to load select's options asynchronously ( through a service), using the Angular Material md-select component. Actually, I use a click event to load data. It works but I need to click the select twice to show the options. That it's a problem. The expected behavior is shown at this link (AngularJs Material) The actual behavior is shown at this link. Is Async options' loading supported by md-select ? 回答1: The reason you need to click twice is because when you first click, there are no

Empty Image Mouse Click

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问题 I am placing an Image in a Grid layout in C# with WPF. I want to have a mouse click event for it, but if the Image source is not set then the event is never fired. Is there a way to change that? I want the event to fire regardless of if the Image source is set or not. <Image Focusable="True" IsEnabled="True" Grid.Row="1" Grid.Column="0" MouseLeftButtonDown="Image_MouseLeftButtonDown" MouseDown="Image_MouseDown" Stretch="Fill" /> The mouse events are never fired unless the property Source is

Javascript mouse click coordinates for image

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问题 The assignment says "Your task is to write an HTML file that contains JavaScript that will randomly display one of the images above. If the page is refreshed in the browser, you should get another random image." so I did it. Now it says "When the user clicks anywhere on the image, display an alert window that shows the X and Y position of where the click occurred relative to the image". Here is my code: <html> <head> <title>Assignment 2</title> <script type="text/javascript"> var imageURLs =

Multiple Control Click Events handled by one event

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问题 I am creating a basic winform application that has many pictureboxes with click events. The click events need to use the name of the picturebox that was clicked in order to execute the rest of the code. I do not want to create unique click events for all of the pictureboxes. I was hoping there would be a simple way to get this information, like using the "sender" parameter or the event arguments. 回答1: You add one click event handler for all of the PictureBoxes: pic1.Click += PictureBoxClick;