borderlesswindow.cpp

#include "borderlesswindow.h"
#include "ui_borderlesswindow.h"
#include "lmsghandler.h"
#include <QDialog>
#include <QDebug>
#include <QPainter>
#include <windows.h>
#include <dwmapi.h>
#pragma comment(lib, "dwmapi.lib")
#pragma comment(lib, "user32.lib")


#include <QMovie>
#include <QLabel>
BorderlessWindow::BorderlessWindow(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::BorderlessWindow),
	_isShadow(false)
{
    ui->setupUi(this);

	/* 虽然在之后的SetWindowLongPtr里面已经设置了各种Style，这里其实已经无意义，但是此处必须设置，
	 * 相当于一个标志，告诉Qt我们是无边框的，否则frameGeometry的返回以及绘制区域都会出现错误.*/
    this->setWindowFlags(Qt::FramelessWindowHint);

	// we cannot just use WS_POPUP style
	// WS_THICKFRAME: without this the window cannot be resized and so aero snap, de-maximizing and minimizing won't work
	// WS_SYSMENU: enables the context menu with the move, close, maximize, minize... commands (shift + right-click on the task bar item)
	// HOWEVER, this also enables the menu with the maximize buttons in the title bar, which will exist inside your client area and are clickable.
	// WS_CAPTION: enables aero minimize animation/transition
	// WS_MAXIMIZEBOX, WS_MINIMIZEBOX: enable minimize/maximize
    SetWindowLongPtr((HWND)this->winId(), GWL_STYLE, WS_POPUP | WS_THICKFRAME
        | WS_CAPTION | WS_SYSMENU | WS_MAXIMIZEBOX | WS_MINIMIZEBOX);

	//因为过滤器我们安在了QAbstractEventDispatcher上，这个过滤器可以收到所有线程的消息，防止影响其他窗体，做一个注册标志.
    LMsgHandler *pMsgHandler = LMsgHandler::getInstance();
	emit pMsgHandler->registerBorderlessWin((quint32)winId());

	setAttribute(Qt::WA_StyledBackground);

    connect(ui->pTitleBar, &LTitleBar::minRequested, this, &QWidget::showMinimized);
    connect(ui->pTitleBar, &LTitleBar::maxRequested, this, &QWidget::showMaximized);
    connect(ui->pTitleBar, &LTitleBar::restoreRequested, this, &QWidget::showNormal);
    connect(ui->pTitleBar, &LTitleBar::closeRequested, this, &QWidget::close);
}

BorderlessWindow::~BorderlessWindow()
{
    delete ui;
}

void BorderlessWindow::on_pAddBtn_clicked()
{
    QWidget *w = new QWidget;
    w->show();
}

void BorderlessWindow::on_pShadowBtn_clicked()
{
	_isShadow = !_isShadow;
	static const MARGINS shadow_state[2] = { { 0, 0, 0, 0 }, { 1, 1, 1, 1 } };
	DwmExtendFrameIntoClientArea((HWND)this->winId(), &shadow_state[_isShadow]);
	// redraw frame
    SetWindowPos((HWND)winId(), nullptr, 0, 0, 0, 0, SWP_FRAMECHANGED | SWP_NOMOVE | SWP_NOSIZE);
}


bool BorderlessWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
{
	const MSG *msg = static_cast<MSG*>(message);

	// WM_CREATE、WM_NCCALCSIZE这两消息在这里获取不到，只能在外面的过滤器才可以获取到.Fuck it.
	if (msg->message == WM_CREATE) {
		int a = 0;
	}
	if (msg->message == WM_NCCALCSIZE) {
		int a = 0;
	}


    if(msg->message == WM_SIZE)
    {
        // fix margin for SIZE_MAXIMIZED
        if(msg->hwnd && msg->wParam == SIZE_MAXIMIZED)
            setContentsMargins(0,0, 16, 16);
        else
            setContentsMargins(0, 0, 0, 0);

        return false;
    }

	if (msg->message == WM_NCHITTEST) {
        const int HIT_BORDER = 8;
		int xPos = ((int)(short)LOWORD(msg->lParam)) - this->frameGeometry().x();
		int yPos = ((int)(short)HIWORD(msg->lParam)) - this->frameGeometry().y();
		
		/* 1、下面的判断顺序不可改变。比如HTTOPLEFT包括Top，我们要保证优先级高的先执行.
		 * 2、每次必须return，不可最后return，因为除了这些情况，我们一定要返回false，让Qt自己处理，否则会影响其他控件的事件接收.*/
		if (xPos > 0 && xPos < HIT_BORDER && yPos > 0 && yPos < HIT_BORDER) {
			*result = HTTOPLEFT;
			return true;
		}
		if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0) && yPos > 0 && yPos < HIT_BORDER) {
			*result = HTTOPRIGHT;
			return true;
		}
		if (xPos > 0 && xPos < HIT_BORDER && yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {
			*result = HTBOTTOMLEFT;
			return true;
		}
		if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0) && yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {
			*result = HTBOTTOMRIGHT;
			return true;
		}
		if (xPos >= 0 && xPos < HIT_BORDER) {
			*result = HTLEFT;
			return true;
		}
		if (xPos >(this->width() - HIT_BORDER) && xPos < (this->width() - 0)) {
			*result = HTRIGHT;
			return true;
		}
		if (yPos >= 0 && yPos < HIT_BORDER) {
			*result = HTTOP;
			return true;
		}
		if (yPos >(this->height() - HIT_BORDER) && yPos < (this->height() - 0)) {
			*result = HTBOTTOM;
			return true;
		}

		// 相当于选中标题栏，用于移动操作.为了判断点击在哪个子窗体上，所以放在这里，没有在LNativeEventFilter中处理.
		if (this->childAt(xPos, yPos) == ui->pTitleBar) {
			*result = HTCAPTION;
			return true;
		}
	}
	return false;
}