eventfilter | 易学教程

Consuming Events with EventFilters

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问题 First, can anyone explain to me, why my MouseEvent gets consumed no matter which Alert -Option I choose? I guess it has something to do with calling an Alert within an EventFilter , but thats just not yet clear to me. public class EventFilterConsumeErrorExample extends Application { @Override public void start( final Stage primaryStage ) { final CheckBox checkBox = new CheckBox( "Check me!" ); checkBox.setOnAction( ( event ) -> { System.out.println( "onAction: " + checkBox.isSelected() ); } )

Key event filtering for numbers, letters or other groups

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问题 Angular4 docs shows ( Key event filtering (with key.enter) ) how to catch keyboard keystrokes events easier - (keyup.enter)="foo()" or keyup.w or keyup.space etc. What I need is to fire event only if letters being pressed. One way I can think of is: <input id="textFilter" (keyup)=“foo($event)”> foo(e){ var allowedKeys = [‘KeyQ’, ‘KeyW’, ‘KeyE’, and the rest of the alphabet...] if (allowedKeys.indexOf(e.code) != -1 ) { return true; } } But I would expect such pseudo-events already build-in in

installEventFilter in PyQt5

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问题 I'm trying to implement an event in PyQT5, but i get this error: TypeError: installEventFilter(self, QObject): argument 1 has unexpected type 'MainWindow_EXEC' This is my code import sys from time import sleep from PyQt5 import QtCore, QtWidgets from view_cortes2 import Ui_cortes2enter class MainWindow_EXEC(): def __init__(self): app = QtWidgets.QApplication(sys.argv) cortes2 = QtWidgets.QMainWindow() self.ui = Ui_cortes2() self.ui.setupUi(cortes2) self.flag = 0 self.ui.ledit_corteA

Consuming Events with EventFilters

阅读更多关于 Consuming Events with EventFilters

First, can anyone explain to me, why my MouseEvent gets consumed no matter which Alert -Option I choose? I guess it has something to do with calling an Alert within an EventFilter , but thats just not yet clear to me. public class EventFilterConsumeErrorExample extends Application { @Override public void start( final Stage primaryStage ) { final CheckBox checkBox = new CheckBox( "Check me!" ); checkBox.setOnAction( ( event ) -> { System.out.println( "onAction: " + checkBox.isSelected() ); } ); checkBox.addEventFilter( MouseEvent.MOUSE_RELEASED, ( event ) -> { System.out.println( "onFilter" );