mouseevent

问题 In OpenCV with C++, Is there a way to remove the mouseHandler(int event, int x, int y, int flags, void* param) {} added to a window "image_window" by function cv::setMouseCallback("image_window", mouseHandler, (void*)param); Thanks for your advice! :-) 回答1: Set the window callback function to NULL like this: cv::setMouseCallback("image_window", NULL, NULL); 来源： https://stackoverflow.com/questions/20278574/how-to-remove-mousecallback-in-opencv

问题 I have a visualization that is essentially a series of stacked bar charts, each of which contains several panels. For example, here are three such bar charts, each with four panels. I have managed to implement pan/zoom functionality that is coordinated across the charts. This is what it looks like if I zoom into the third panel from the last image, for example. The zoom behavior is called from an invisible rectangle that is placed over each chart. My problem is that I want to enable tooltip

问题 I have a visualization that is essentially a series of stacked bar charts, each of which contains several panels. For example, here are three such bar charts, each with four panels. I have managed to implement pan/zoom functionality that is coordinated across the charts. This is what it looks like if I zoom into the third panel from the last image, for example. The zoom behavior is called from an invisible rectangle that is placed over each chart. My problem is that I want to enable tooltip

问题 This question already has answers here : Java Dialog - Find out if OK is clicked? (4 answers) Closed 3 years ago . How can I add a listener on the click of "OK" button of JOptionPane.INFORMATION_MESSAGE . My JOptionPane is: JOptionPane.showMessageDialog(null, "Your password is: " + password, "Your Password", JOptionPane.INFORMATION_MESSAGE); 回答1: The showMessageDialog method returns void when the user closes or clicks ok. But you can use the method JOptionPane.showOptionDialog with a single

问题 I'm working on writing a custom scrollbar and am catching the mousewheel event. I'm using this to then adjust the scrollTop of the element I want to scroll on. Is there a standard number of pixels that are scrolled down, or does it vary from system to system? I'm showing 114px in the latest build of Firefox: 回答1: Many mouse drivers let you set the distance scrolled by the mouse wheel, so there is not a standard distance. I'd try your code out for a while and pick a distance that keeps you

问题 I'm making a console application for unix platforms, and I'm using the curses (or ncurses) library to handle keyboard and mouse input. The problem is that I've found very little documentation on how exactly to use it for that, appart from this page and this one, which don't have very detailed examples. I've managed to capture the left click, but I can't get it to work for the right click because the options menu for the terminal emulator appears at the cursor location, but the event is not

问题 I have series of interactive sliders that change calculated values. The calculations run on every tiny move of a dragged handle (via mousedown or touch drag event). I need to update a database with the values but would prefer only to grab the values after the user "drops" the handle. How can I determine if a finger or mouse is down, in order to skip the AJAX call? function handleIsBeingDragged() { // calculations based on all the input values here // pseudo-code to check for mouseup event if

问题 I'm making a GUI in Matlab that scrolls through and displays ~600 medical images. I have an axes on which the images are displayed, and a scrollbar that presently goes through images one at a time when the end arrows are pressed. I'm trying to figure out how to incorporate the WindowScrollWheelFcn so I can use the scroll on the mouse to go through the images faster. This is my code: function ct_slider_Callback(hObject, eventdata, handles) set(gcf, 'WindowScrollWheelFcn', @wheel); set(gcf,

问题 I have a <p> containing text. When the <p> is clicked on, I create a <textarea> containing the text from the <p> . Is it possible to calculate where in the <p> 's text the click occurred, and move the <textarea> 's cursor to that same point? 回答1: I don't believe so, no. The DOM just knows what containing element received the click event, it doesn't distinguish between pieces of text within the containing element unless they are elements themselves. And I doubt you want to wrap every character

问题 I have a google map in an iframe and wrapped in a div. Above that div, i have another, which serves to create a recessed shadow effect. The problem is that this overlayed div will take priority of any mouse events, so it renders the interactive google map below useless. There must be a way I can make the overlayed div ignore mouse events, letting the div below get them. (please, please!) Or, is there another way to do it? here's the code being output: <div id="pageWrapper" style="display: