formwindow.cpp

QT 开发环境里面一个很重要的文件

/****************************************************************************
**
** Copyright (C) 1992-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the Qt Designer of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.  Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at [e-mail].
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

/*
TRANSLATOR qdesigner_internal::FormWindow
*/

#include "formwindow.h"
#include "formwindow_dnditem.h"
#include "formwindow_widgetstack.h"
#include "formwindowcursor.h"
#include "formwindowmanager.h"
#include "tool_widgeteditor.h"
#include "widgetselection.h"

// shared
#include <qdesigner_promotedwidget_p.h>
#include <qdesigner_tabwidget_p.h>
#include <qdesigner_toolbox_p.h>
#include <qdesigner_stackedbox_p.h>
#include "qdesigner_resource.h"
#include <qdesigner_command_p.h>
#include <qdesigner_widget_p.h>
#include <qdesigner_utils_p.h>
#include <qlayout_widget_p.h>
#include <spacer_widget_p.h>
#include <invisible_widget_p.h>
#include <layoutinfo_p.h>
#include <connectionedit_p.h>
#include <actionprovider_p.h>

// sdk
#include <QtDesigner/QtDesigner>

#include <QtGui>
#include <QtDebug>

namespace qdesigner_internal {

class FriendlyWidget: public QWidget
{
public:
    FriendlyWidget() { Q_ASSERT(0); }

    friend class FormWindow;
};

class BlockSelection
{
public:
    BlockSelection(FormWindow *fw)
        : m_formWindow(fw)
    {
        if (m_formWindow)
            m_blocked = m_formWindow->blockSelectionChanged(true);
    }

    ~BlockSelection()
    {
        if (m_formWindow)
            m_formWindow->blockSelectionChanged(m_blocked);
    }

private:
    QPointer<FormWindow> m_formWindow;
    bool m_blocked;
};

FormWindow::FormWindow(FormEditor *core, QWidget *parent, Qt::WindowFlags flags)
    : QDesignerFormWindowInterface(parent, flags),
      m_core(core), m_widgetStack(0)
{
    init();

    m_cursor = new FormWindowCursor(this, this);

    core->formWindowManager()->addFormWindow(this);

    setDirty(false);
}

FormWindow::~FormWindow()
{
    Q_ASSERT(core() != 0);
    Q_ASSERT(core()->metaDataBase() != 0);
    Q_ASSERT(core()->formWindowManager() != 0);

    core()->formWindowManager()->removeFormWindow(this);
    core()->metaDataBase()->remove(this);

    QList<QWidget*> l = widgets();
    foreach (QWidget *w, l)
        core()->metaDataBase()->remove(w);

    m_widgetStack = 0;
    m_rubberBand = 0;

    qDeleteAll(selections);
}

QDesignerFormEditorInterface *FormWindow::core() const
{
    return m_core;
}

QDesignerFormWindowCursorInterface *FormWindow::cursor() const
{
    return m_cursor;
}

bool FormWindow::hasFeature(Feature f) const
{
    return f & m_feature;
}

void FormWindow::updateWidgets()
{
    if (!m_mainContainer)
        return;
}

int FormWindow::widgetDepth(QWidget *w)
{
    int d = -1;
    while (w && !w->isWindow()) {
        d++;
        w = w->parentWidget();
    }

    return d;
}

bool FormWindow::isChildOf(QWidget *c, const QWidget *p)
{
    while (c /*&& !c->isWindow()*/) {
        if (c == p)
            return true;
        c = c->parentWidget();
    }
    return false;
}

FormWindow::Feature FormWindow::features() const
{
    return m_feature;
}

static void recursiveUpdate(QWidget *w)
{
    w->update();

    const QObjectList &l = w->children();
    QObjectList::const_iterator it = l.begin();
    for (; it != l.end(); ++it) {
        if (QWidget *w = qobject_cast<QWidget*>(*it))
            recursiveUpdate(w);
    }
}

void FormWindow::setFeatures(Feature f)
{
    m_feature = f;
    emit featureChanged(f);
    recursiveUpdate(this);
}

void FormWindow::setCursorToAll(const QCursor &c, QWidget *start)
{
    start->setCursor(c);
    QList<QWidget*> widgets = qFindChildren<QWidget*>(start);
    foreach (QWidget *widget, widgets) {
        if (!qobject_cast<WidgetHandle*>(widget)) {
            widget->setCursor(c);
        }
    }
}

void FormWindow::init()
{
    if (FormWindowManager *manager = qobject_cast<FormWindowManager*> (core()->formWindowManager())) {
        m_commandHistory = new QUndoStack(this);
        manager->undoGroup()->addStack(m_commandHistory);
    }

    m_blockSelectionChanged = false;

    m_defaultMargin = INT_MIN;
    m_defaultSpacing = INT_MIN;

    QHBoxLayout *layout = new QHBoxLayout(this);
    layout->setMargin(0);

    m_widgetStack = new FormWindowWidgetStack(this);
    connect(m_widgetStack, SIGNAL(currentToolChanged(int)), this, SIGNAL(toolChanged(int)));
    layout->addWidget(m_widgetStack);

    m_feature = DefaultFeature;

    m_selectionChangedTimer = new QTimer(this);
    m_selectionChangedTimer->setSingleShot(true);
    connect(m_selectionChangedTimer, SIGNAL(timeout()), this, SLOT(selectionChangedTimerDone()));

    m_checkSelectionTimer = new QTimer(this);
    m_checkSelectionTimer->setSingleShot(true);
    connect(m_checkSelectionTimer, SIGNAL(timeout()), this, SLOT(checkSelectionNow()));

    m_geometryChangedTimer = new QTimer(this);
    m_geometryChangedTimer->setSingleShot(true);
    connect(m_geometryChangedTimer, SIGNAL(timeout()), this, SIGNAL(geometryChanged()));

    m_rubberBand = 0;

    setGrid(QPoint(10,10));

    setFocusPolicy(Qt::StrongFocus);

    m_mainContainer = 0;
    m_currentWidget = 0;
    oldRectValid = false;
    drawRubber = false;

    targetContainer = 0;
    hadOwnPalette = false;
    startWidget = 0;
    endWidget = 0;

    connect(m_commandHistory, SIGNAL(indexChanged(int)), this, SLOT(updateDirty()));
    connect(m_commandHistory, SIGNAL(indexChanged(int)), this, SIGNAL(changed()));
    connect(m_commandHistory, SIGNAL(indexChanged(int)), this, SLOT(checkSelection()));

    core()->metaDataBase()->add(this);

    initializeCoreTools();

    QAction *a = new QAction(this);
    a->setText(tr("Edit contents"));
    a->setShortcut(tr("F2"));
    connect(a, SIGNAL(triggered()), this, SLOT(editContents()));
    addAction(a);
}

QWidget *FormWindow::mainContainer() const
{
    return m_mainContainer;
}

void FormWindow::setMainContainer(QWidget *w)
{
    if (w == m_mainContainer) {
        // nothing to do
        return;
    }

    if (m_mainContainer) {
        unmanageWidget(m_mainContainer);
        delete m_mainContainer;
        m_mainContainer = 0;
    }

    m_mainContainer = w;
    w->setAutoFillBackground(true);
    QSize sz = m_mainContainer->size();

    m_mainContainer->setParent(m_widgetStack, 0);
    m_mainContainer->raise();
    m_mainContainer->show();

    m_widgetStack->setCurrentTool(m_widgetEditor);

    setCurrentWidget(m_mainContainer);

    manageWidget(m_mainContainer);

    if (QDesignerPropertySheetExtension *sheet = qt_extension<QDesignerPropertySheetExtension*>(core()->extensionManager(), m_mainContainer)) {
        sheet->setVisible(sheet->indexOf(QLatin1String("windowTitle")), true);
        sheet->setVisible(sheet->indexOf(QLatin1String("windowIcon")), true);
        // ### generalize
    }

    m_mainContainer->setFocusPolicy(Qt::StrongFocus);
    m_mainContainer->resize(sz);

    emit mainContainerChanged(m_mainContainer);
}

QWidget *FormWindow::findTargetContainer(QWidget *widget) const
{
    Q_ASSERT(widget);

    while (QWidget *parentWidget = widget->parentWidget()) {
        if (LayoutInfo::layoutType(m_core, parentWidget) == LayoutInfo::NoLayout && isManaged(widget))
            return widget;

        widget = parentWidget;
    }

    return mainContainer();
}

bool FormWindow::handleMousePressEvent(QWidget * /*widget*/, QWidget *managedWidget, QMouseEvent *e)
{
    startPos = QPoint();
    e->accept();

    BlockSelection blocker(this);

    if (core()->formWindowManager()->activeFormWindow() != this)
        core()->formWindowManager()->setActiveFormWindow(this);

    if (e->buttons() != Qt::LeftButton)
        return true;

    startPos = mapFromGlobal(e->globalPos());

    bool inLayout = LayoutInfo::isWidgetLaidout(m_core, managedWidget);

    // if the dragged widget is not in a layout, raise it
    if (inLayout == false)
        managedWidget->raise();

    if (isMainContainer(managedWidget) == true) { // press was on the formwindow
        clearSelection(false);

        drawRubber = true;
        currRect = QRect();
        startRectDraw(mapFromGlobal(e->globalPos()), this, Rubber);
        return true;
    }

    bool selected = isWidgetSelected(managedWidget);

    if (e->modifiers() & Qt::ShiftModifier) {
        // shift-click - toggle selection state of widget
        selectWidget(managedWidget, !selected);
        return true;
    }

    QWidget *current = managedWidget;

    if (!selected)
        clearSelection(false);

    bool curLaidOut = false;
    bool curSelected = false;
    for (;;) {
        curLaidOut = current ? LayoutInfo::isWidgetLaidout(core(), current) : false;
        curSelected = current ? isWidgetSelected(current) : false;

        if (!current || !curLaidOut || !curSelected)
            break;

        current = designerWidget(current->parentWidget());
    }

    if (!(current == 0 || !curLaidOut && curSelected)) {
        selectWidget(current);
        raiseChildSelections(current);
    }

    return true;
}

bool FormWindow::isPageOfContainerWidget(QWidget *widget) const
{
    QDesignerContainerExtension *c = qt_extension<QDesignerContainerExtension*>(core()->extensionManager(),
                widget->parentWidget());

    if (c != 0) {
        for (int i = 0; i<c->count(); ++i) {
            if (widget == c->widget(i))
                return true;
        }
    }

    return false;
}

bool FormWindow::handleMouseMoveEvent(QWidget *, QWidget *, QMouseEvent *e)
{
    e->accept();

    if (e->buttons() != Qt::LeftButton || startPos.isNull())
        return true;

    QPoint pos = mapFromGlobal(e->globalPos());

    if (drawRubber == true) {
        continueRectDraw(pos, this, Rubber);
        return true;
    }

    bool canStartDrag = (startPos - pos).manhattanLength() > QApplication::startDragDistance();

    if (canStartDrag == false) {
        // nothing to do
        return true;
    }

    bool blocked = blockSelectionChanged(true);

    QList<QWidget*> sel = selectedWidgets();
    simplifySelection(&sel);

    QSet<QWidget*> widget_set;

    foreach (QWidget *child, sel) {
        QWidget *current = child;

        bool done = false;
        while (!isMainContainer(current) && !done) {
            QDesignerContainerExtension *c = 0;
            c = qt_extension<QDesignerContainerExtension*>(core()->extensionManager(), current->parentWidget());

            if (!isManaged(current)) {
                current = current->parentWidget();
                continue;
            } else if (LayoutInfo::isWidgetLaidout(core(), current)) {
                current = current->parentWidget();
                continue;
            } else if (isPageOfContainerWidget(current)) {
                current = current->parentWidget();
                continue;
            } else if (current->parentWidget()) {
                QScrollArea *area = qobject_cast<QScrollArea*>(current->parentWidget()->parentWidget());
                if (area && area->widget() == current) {
                    current = area;
                    continue;
                }
            }

            done = true;
        }

        if (current == mainContainer())
            continue;

        widget_set.insert(current);
    }