以编程方式调用Snap / Aero最大化

本文介绍了以编程方式调用Snap / Aero最大化的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

是否可以使用C或C ++以编程方式调用Aera最大化效果的特定窗口/窗口ID？

例如：

或

（来源：，则可以看到最快的&使用Qt进行动画制作的最肮脏的方法，以及处理动画的更好方法。但是，对于这样的简单任务，请坚持使用 基于帧的动画。

main.cpp ：

#include window.h #include< QApplication> int main（int argc，char * argv []） { QApplication app（argc，argv）; 窗口窗口； window.show（）; 返回app.exec（）; }

window.h ：

#pragma一旦 #include snapwindow.h #include< QMainWindow> #include< QEvent> class Window：public QMainWindow { public： Window（）; void resizeEvent（QResizeEvent * evt）; // void paintEvent（QPaintEvent *事件）; void changeEvent（QEvent * evt）; 私人： SnapWindow * _sw; };

window.cpp ：

#include window.h #include snapwindow.h #include< QDebug> #include< QWindowStateChangeEvent> #include< QApplication> #include< QDesktopWidget> Window :: Window（） { setWindowTitle（ AeroSnap）; 调整大小（300，300）; _sw =新的SnapWindow（this）; _sw-> hide（）; } void Window :: changeEvent（QEvent * evt） { if（evt-> type（）== QEvent :: WindowStateChange） { QWindowStateChangeEvent * event = static_cast< QWindowStateChangeEvent *>（evt）; if（event-> oldState（）== Qt :: WindowNoState&& windowState（）== Qt :: WindowMaximized） { qDebug（）<< changeEvent：窗口现在已最大化！; } } } // resizeEvent在window_maximized事件无效之前触发Window :: resizeEvent（QResizeEvent * evt） { qDebug（）<< resizeEvent：请求将窗口大小调整为：<< evt-> size（）; QSize desktop_sz = QApplication :: desktop（）-> size（）; // qDebug（）<< resizeEvent：桌面sz<< desktop_sz.width（）<< x<< desktop_sz.height（）; //显然，窗口在我的系统中可以具有的最大大小（1920x1080） //实际上是1920x990。我怀疑这是因为任务栏的高度为90px： desktop_sz.setHeight（desktop_sz.height（）-90）; //如果这不是最大化窗口的请求，请不要做任何疯狂的事情。 if（desktop_sz.width（）！= evt-> size（）。width（）|| desktop_sz.height（）！= evt-> size（）。height（））回报； //好吧，现在我们知道这是一个最大化请求： qDebug（）<< resizeEvent：将此窗口最大化到左侧； //因此，我们将窗口的几何形状（即大小和位置） //更新为我们认为合适的值：左侧的一半宽度 int new_width = evt-> ; size（）。width（）; int new_height = evt-> size（）。height（）; int x_offset = 10; setGeometry（x_offset，45，new_width / 2，new_height-45）; // y 45和高度-45归因于90px问题 / *绘制航空捕捉小部件* / _sw-> setGeometry（new_width / 2-x_offset， 0，new_width / 2，new_height）; _sw-> show（）; //该方法结束后将自动调用paintEvent（）， //并使用适当的几何图形绘制此窗口。 }

snapwindow.h ：

#pragma一旦 #include< QWidget> class SnapWindow：public QWidget { public： SnapWindow（QWidget * parent = 0）; void paintEvent（QPaintEvent * event）; };

snapwindow.cpp ：

#include snapwindow.h #include< QPainter> #include< QGraphicsDropShadowEffect> SnapWindow :: SnapWindow（QWidget *父级）：QWidget（父级） { //将其设置为顶层（即归用户所有） setParent（0）; / *注意：创建透明窗口的魔力* / setWindowFlags（Qt :: Widget | Qt :: FramelessWindowHint）; setStyleSheet（ background：transparent;）; setAttribute（Qt :: WA_NoSystemBackground，true）; //通过消除不必要的背景初始化 setAttribute（Qt :: WA_TranslucentBackground）;来加快绘图速度 // setAutoFillBackground（true）; / *使用Qt技巧来绘制带有阴影的东西* / QGraphicsDropShadowEffect * effect = new QGraphicsDropShadowEffect（）; effect-> setBlurRadius（12）; effect-> setOffset（0）; effect-> setColor（QColor（0，0，0，255））; setGraphicsEffect（effect）; } void SnapWindow :: paintEvent（QPaintEvent * event） { QWidget :: paintEvent（event）; / *绘制阴影的懒方法* / QPainter画家（this）; QPen pen（QColor（180，180，180，200））; pen.setWidth（3）; painter.setPen（pen）; //偏移6和9像素，以便阴影正确显示 painter.drawRoundedRect（QRect（6，6，（width（）-1）-9，（height（）- 1）-9），18、18）； }

这只是一个快速演示，可为您指明正确的方向。这绝不是您想要的效果的完整实现。

Is there a way to programmatically invoke the Aera maximize effect using C or C++ for a specific window/window ID?

For example:

or

(source: thebuzzmedia)

I am using a border-less Qt window and Qt has an API for getting the window ID. I want to programmatically trigger the windows effects without the known triggers.

解决方案

I don't want to talk about every single detail involved in achieving this effect, not only there's a lot that goes on but you also mentioned you understand the logic to place the windows at their specific locations. In this answer I'll address what I believe are the 2 main challenges:

• How to receive and handle a maximize event?

• How to create an approximation of the aero snap effect?

In order to answer the first question, we must analyze which event handlers are triggered when the window is maximized:

void resizeEvent(QResizeEvent* evt); // Invoked first, void paintEvent(QPaintEvent* event); // then second, void changeEvent(QEvent* evt); // and at last.

A Qt application is first notified of a resizeEvent(), which is followed by a paintEvent() to draw the window (or widget), and only after everything has been displayed, changeEvent() is invoked to let you know the widget was maximized (maybe it's a little bit late to receive such notification, I don't know).

Of all these, the only one we care about is resizeEvent(). This event handler informs the new window/widget size that can be used for comparison with the desktop size, thus allowing us to know if the event was actually a maximize request. Once we identify a maximize request, we can figure out whether the application should be maximized (and anchored) to right, left or to the center of the screen.

This would be the time to create the aero snap widget and place it on the screen as a visual clue to the user.

To answer the second question, I don't think is possible to call the native Windows API and ask it politely to perform this effect on your window. The only other logical choice is to write a code that approximates this effect ourselves.

The visual appearance can be replicated by drawing a transparent window with a shadow-ish border. The approach demonstrated in the source code below, creates and customizes a QWidget to make it behave and look like a aero snap window:

It's not the most beautiful thing in the world, I know. This demo creates a regular window for the user to interact with, and once it's maximized, it places itself to the left of the screen. To the right size of the screen it displays something that resembles an aero snap window (shown above).

The idea behind the aero snap widget is very simple: a QWidget with transparent background and a custom painting procedure. In other words, it's a transparent window which draws a rounded rectangle with a shadow and that's it.

To make it a bit more realistic, you should add some animation to resize the widget little by little. A for loop might do the trick, but if you need something fancy you'll end up using timers. If you take a look here, you can see the quickest & dirtiest method to perform animation with Qt in action, and better ways to deal with animation. However, for simple tasks like this, stick with frame-based animation.

main.cpp:

#include "window.h" #include <QApplication> int main(int argc, char* argv[]) { QApplication app(argc, argv); Window window; window.show(); return app.exec(); }

window.h:

#pragma once #include "snapwindow.h" #include <QMainWindow> #include <QEvent> class Window : public QMainWindow { public: Window(); void resizeEvent(QResizeEvent* evt); //void paintEvent(QPaintEvent* event); void changeEvent(QEvent* evt); private: SnapWindow* _sw; };

window.cpp:

#include "window.h" #include "snapwindow.h" #include <QDebug> #include <QWindowStateChangeEvent> #include <QApplication> #include <QDesktopWidget> Window::Window() { setWindowTitle("AeroSnap"); resize(300, 300); _sw = new SnapWindow(this); _sw->hide(); } void Window::changeEvent(QEvent* evt) { if (evt->type() == QEvent::WindowStateChange) { QWindowStateChangeEvent* event = static_cast<QWindowStateChangeEvent*>(evt); if (event->oldState() == Qt::WindowNoState && windowState() == Qt::WindowMaximized) { qDebug() << "changeEvent: window is now maximized!"; } } } // resizeEvent is triggered before window_maximized event void Window::resizeEvent(QResizeEvent* evt) { qDebug() << "resizeEvent: request to resize window to: " << evt->size(); QSize desktop_sz = QApplication::desktop()->size(); //qDebug() << "resizeEvent: desktop sz " << desktop_sz.width() << "x" << desktop_sz.height(); // Apparently, the maximum size a window can have in my system (1920x1080) // is actually 1920x990. I suspect this happens because the taskbar has 90px of height: desktop_sz.setHeight(desktop_sz.height() - 90); // If this not a request to maximize the window, don't do anything crazy. if (desktop_sz.width() != evt->size().width() || desktop_sz.height() != evt->size().height()) return; // Alright, now we known it's a maximize request: qDebug() << "resizeEvent: maximize this window to the left"; // so we update the window geometry (i.e. size and position) // to what we think it's appropriate: half width to the left int new_width = evt->size().width(); int new_height = evt->size().height(); int x_offset = 10; setGeometry(x_offset, 45, new_width/2, new_height-45); // y 45 and height -45 are due to the 90px problem /* Draw aero snap widget */ _sw->setGeometry(new_width/2-x_offset, 0, new_width/2, new_height); _sw->show(); // paintEvent() will be called automatically after this method ends, // and will draw this window with the appropriate geometry. }

snapwindow.h:

#pragma once #include <QWidget> class SnapWindow : public QWidget { public: SnapWindow(QWidget* parent = 0); void paintEvent(QPaintEvent *event); };

snapwindow.cpp:

#include "snapwindow.h" #include <QPainter> #include <QGraphicsDropShadowEffect> SnapWindow::SnapWindow(QWidget* parent) : QWidget(parent) { // Set this widget as top-level (i.e. owned by user) setParent(0); /* Behold: the magic of creating transparent windows */ setWindowFlags(Qt::Widget | Qt::FramelessWindowHint); setStyleSheet("background:transparent;"); setAttribute(Qt::WA_NoSystemBackground, true); // speed up drawing by removing unnecessary background initialization setAttribute(Qt::WA_TranslucentBackground); //setAutoFillBackground(true); /* Use Qt tricks to paint stuff with shadows */ QGraphicsDropShadowEffect* effect = new QGraphicsDropShadowEffect(); effect->setBlurRadius(12); effect->setOffset(0); effect->setColor(QColor(0, 0, 0, 255)); setGraphicsEffect(effect); } void SnapWindow::paintEvent(QPaintEvent *event) { QWidget::paintEvent(event); /* Lazy way of painting a shadow */ QPainter painter(this); QPen pen(QColor(180, 180, 180, 200)); pen.setWidth(3); painter.setPen(pen); // Offset 6 and 9 pixels so the shadow shows up properly painter.drawRoundedRect(QRect(6, 6, (width()-1)-9, (height()-1)-9), 18, 18); }

This is just a quick demo to point you to the right direction. It is by no means a complete implementation of the effect you are looking for.