mouseevent

问题 I know, that I can write a function as an event for each component in a form to do something (e.g. when hovering with the mouse). Is there also a possibility to call an event function without linking the event to the specific component but for all of them in an application? What I want to achieve is to display e.g. the handle (Control.Handle) or more information about any component by just hovering the mouse over it. Thanks in advance. 回答1: You can dynamycally set the event for all controls

问题 I know, that I can write a function as an event for each component in a form to do something (e.g. when hovering with the mouse). Is there also a possibility to call an event function without linking the event to the specific component but for all of them in an application? What I want to achieve is to display e.g. the handle (Control.Handle) or more information about any component by just hovering the mouse over it. Thanks in advance. 回答1: You can dynamycally set the event for all controls

问题 I'd like to implement click detection for multiple complex shapes on a single canvas element similar to that as realized by CanvasRenderingContext2D.isPointInPath() . Obligatory example code below. HTML: <canvas id="canvas"></canvas> <p>In path: <code id="result">false</code></p> JS: const canvas = document.getElementById('canvas'); const ctx = canvas.getContext('2d'); const result = document.getElementById('result'); ctx.beginPath(); ctx.moveTo(25, 25); ctx.lineTo(105, 25); ctx.lineTo(25,

问题 I am using Delphi 10.1 Berlin to make a Multi-Device application. I have a TStringGrid in order to list some data from a query. I also have a popup menu (edit, delete, ...), but in order to edit/delete an item I have to click on a cell using the left mouse button. Is it possible to "select a row" using only the right button before showing the popup menu? I tried: procedure TForm1.StringGrid1MouseDown(Sender: TObject; Button: TMouseButton; Shift: TShiftState; X, Y: Integer); begin if Button =

问题 I have been trying to get the mouse x,y coordinates to variables according to matplotlib plot scale not pixels but it only returns me the integer components like 0.0 or 1.0 I want to return the accurate number like 0.1245 here is my code import matplotlib import Tkinter as tk from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg from matplotlib.figure import Figure import numpy as np import matplotlib.pyplot as plt def onclick(self,event): ix, iy = float

问题 I'm creating a small image editor and right now i'm trying to give the user the chance of drawing over the image by dragging the mouse (like pencil tool in MS Paint does). I'm having some difficulties since, when i move the cursor too fast, the application can't draw all the pixels which should be colored, just a little number is correctly colored. I tried two solutions to add the colored pixels: at first i created a list where i stored all the points added when mouseDragged was called. After

问题 I have a big rectangle with a button centered. I would like that my rectangle is transparent to mouse events except for the button, which must be clickable. I mean, I would like to be able to select code under my rectangle with the mouse, exactly as if no Rectangle was displayed. I have added a MouseArea for all the big Rect, trying to ignore mouse events, but it does not work. I read that 'Qt::WA_TransparentForMouseEvents' is used for that purpose, but in Qt windows as fasr as I know, not

问题 I tried almost everything, but the mouse drag events are not firing, like explained here: https://openjfx.io/javadoc/11/javafx.graphics/javafx/scene/input/MouseDragEvent.html Here is a minimal example, so you can try it out (I am using Java 11 with JavaFX 11.0.2): import javafx.application.Application; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.control.Button; import javafx.scene.layout.*; import javafx.stage.Stage; public class Main extends Application {

问题 This question already has answers here : How to make smooth movement in pygame (2 answers) How to make enemy follow player in pygame? [duplicate] (2 answers) Enemy doesn't follow player (pygame) [duplicate] (2 answers) Closed 4 months ago . Initially the image starts moving in the direction (0,0). During each frame, the object looks at the current location of the cursor using pygame.mouse.get_pos() and updates it's direction to be direction = .9*direction + v where v is a vector of length 10

问题 Is it possible to receive a mouse click even in a Qt application, evaluate it, and if necessary, let it fall through to whatever might happen to be below the Qt application window? Note that Qt::WA_TransparentForMouseEvents doesn't facilitate evaluating the click before passing it through. And since the click evaluation incorporates some dynamic logic, it is not applicable to set a static mask either, on top of this having a visual impact as well. Ideally, I would like a way to selectively