有没有办法使用C或C ++针对特定的窗口/窗口ID以编程方式调用Aera最大化效果?
例如:
例如:
或者
(来源:thebuzzmedia.com)
我正在使用一个无边框的Qt窗口,并且Qt有一个API可以获取窗口ID。我想通过编程方式触发窗口效果,而不是使用已知的触发器。
或者
(来源:thebuzzmedia.com)
我正在使用一个无边框的Qt窗口,并且Qt有一个API可以获取窗口ID。我想通过编程方式触发窗口效果,而不是使用已知的触发器。
我不想讨论实现这种效果所涉及的每一个细节,不仅有很多事情要做,而且您还提到了您理解将窗口放置在特定位置的逻辑。 在这个答案中,我将解决我认为的两个主要挑战:
如何接收和处理最大化事件?
如何创建类似于aero snap的效果的近似值?
为了回答第一个问题,我们必须分析窗口最大化时触发哪些event handlers:
void resizeEvent(QResizeEvent* evt); // Invoked first,
void paintEvent(QPaintEvent* event); // then second,
void changeEvent(QEvent* evt); // and at last.
resizeEvent()
通知,此后会执行paintEvent()
来绘制窗口(或部件),只有在所有内容都显示之后,才会调用changeEvent()
来告诉你该部件已被最大化(也许这个通知有点晚了,我不确定)。resizeEvent()
。此事件处理程序会通知新窗口/部件大小,可将其与桌面大小进行比较,从而允许我们知道该事件是否实际上是一个最大化请求。一旦我们确定了最大化请求,我们就可以确定应用程序应该最大化(并锚定)到屏幕的右侧、左侧还是中心。QWidget
使其表现和外观类似于 aero snap 窗口:
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);
}
SnapWindow
在调整大小事件上被触发,所以当我调整窗口大小时,它应该做出反应。但对我来说并没有发生任何事情。我在主窗口上调用了 setWindowFlags(Qt::FramelessWindowHint)
和 setStatusBar(new QStatusBar());
,但调整大小并没有起作用,尽管事件函数已经被调用:http://i.imgur.com/2WyCPv3.png 这可能是因为我使用的是 Windows 7 吗? - Jacob KriegresizeEvent()
函数决定了是否发生了最大化事件。花些时间在这个函数中,添加调试信息以熟悉它。根据你的描述,这个逻辑在你的电脑上出现了问题,最有可能的原因是使用了某个“魔法数字”(90)(搜索字符串“1920x1080”并阅读注释)。然而,如果您使用了2个显示器,也可能会失败,因为 QApplication::desktop()->size()
返回的是监视器1 + 监视器2的总大小。 - karlphillipbool left = false;
QSize size = QApplication::desktop()->size();//resolution of current screen
if(left)
{//left side
this->setGeometry(0, 0, size.width()/2, size.height());//(maybe need do some changes)
}
else
{//right side
this->setGeometry(size.width()/2, 0, size.width()/2, size.height());
}
使用QApplication::desktop()
可以在不同分辨率的屏幕上正常工作。
在网上我找到了类似于winapi
的东西,但它不能正常工作:
HWND act = GetForegroundWindow();
PostMessage((HWND)act,WM_NCLBUTTONDBLCLK, HTTOP, 0);
最佳方式
将这些方法结合起来。例如:
HWND act = GetForegroundWindow();
bool left = false;
QSize size = QApplication::desktop()->size();
if(left)
{
this->move(0,0);
PostMessage((HWND)act,WM_NCLBUTTONDBLCLK, HTTOP, 0);
this->resize(size.width()/2,QApplication::desktop()->height());
}
else
{
this->move(size.width()/2,0);
PostMessage((HWND)act,WM_NCLBUTTONDBLCLK, HTTOP, 0);
this->resize(size.width()/2,QApplication::desktop()->height());
}
bool left = true;
bool upper = true;
if(upper)
{
QRect rect = QApplication::desktop()->availableGeometry(-1);
this->setGeometry(rect);
}
else if(left)
{
QRect rect = QApplication::desktop()->availableGeometry(-1);
rect.setWidth(rect.width()/2);
this->setGeometry(rect);
}
else
{
QRect rect = QApplication::desktop()->availableGeometry(-1);
int half = rect.width()/2;
rect.setX(half);
rect.setWidth(half);
this->setGeometry(rect);
}