qdesigner_command.cpp

QT 开发环境里面一个很重要的文件

    m_widget->setGeometry(m_geometry);
    formWindow()->manageWidget(m_widget);

    // Manage the managed children
    foreach (QWidget *child, m_managedChildren)
        formWindow()->manageWidget(child);

    // ### set up alignment
    switch (m_layoutType) {
        case LayoutInfo::VBox: {
            QVBoxLayout *vbox = static_cast<QVBoxLayout*>(m_parentWidget->layout());
            insert_into_box_layout(vbox, m_index, m_widget);
        } break;

        case LayoutInfo::HBox: {
            QHBoxLayout *hbox = static_cast<QHBoxLayout*>(m_parentWidget->layout());
            insert_into_box_layout(hbox, m_index, m_widget);
        } break;

        case LayoutInfo::Grid: {
            QGridLayout *grid = static_cast<QGridLayout*>(m_parentWidget->layout());
            add_to_grid_layout(grid, m_widget, m_row, m_col, m_rowspan, m_colspan);
        } break;

        default:
            break;
    } // end switch

    m_widget->show();

    if (m_tabOrderIndex != -1) {
        QList<QWidget*> tab_order = m_formItem->tabOrder();
        tab_order.insert(m_tabOrderIndex, m_widget);
        m_formItem->setTabOrder(tab_order);
    }

    formWindow()->emitSelectionChanged();
}

// ---- ReparentWidgetCommand ----
ReparentWidgetCommand::ReparentWidgetCommand(QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QString(), formWindow)
{
}

void ReparentWidgetCommand::init(QWidget *widget, QWidget *parentWidget)
{
    Q_ASSERT(widget);

    m_widget = widget;
    m_oldParentWidget = widget->parentWidget();
    m_newParentWidget = parentWidget;

    m_oldPos = m_widget->pos();
    m_newPos = m_newParentWidget->mapFromGlobal(m_oldParentWidget->mapToGlobal(m_oldPos));

    setText(QApplication::translate("Command", "Reparent '%1'").arg(widget->objectName()));
}

void ReparentWidgetCommand::redo()
{
    m_widget->setParent(m_newParentWidget);
    m_widget->move(m_newPos);

    m_widget->show();
}

void ReparentWidgetCommand::undo()
{
    m_widget->setParent(m_oldParentWidget);
    m_widget->move(m_oldPos);

    m_widget->show();
}

// ---- PromoteToCustomWidgetCommand ----

static void replace_widget_item(QDesignerFormWindowInterface *fw, QWidget *wgt, QWidget *promoted)
{
    QDesignerFormEditorInterface *core = fw->core();
    QWidget *parent = wgt->parentWidget();

    promoted->setMinimumSize(wgt->minimumSize());
    promoted->setMaximumSize(wgt->maximumSize());

    QRect info;
    int splitter_idx = -1;
    if (QDesignerLayoutDecorationExtension *deco = qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), parent)) {
        if (QSplitter *splitter = qobject_cast<QSplitter*>(parent)) {
            splitter_idx = splitter->indexOf(wgt);
            Q_ASSERT(splitter_idx != -1);
            wgt->setParent(0);
        } else {
            QLayout *layout = LayoutInfo::managedLayout(core, parent);
            Q_ASSERT(layout != 0);

            int old_index = layout->indexOf(wgt);
            Q_ASSERT(old_index != -1);

            info = deco->itemInfo(old_index);

            QLayoutItem *item = layout->takeAt(old_index);
            delete item;
            layout->activate();
        }
    }

    if (qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), parent)) {
        if (QSplitter *splitter = qobject_cast<QSplitter*>(parent)) {
            splitter->insertWidget(splitter_idx, promoted);
        } else {
            QLayout *layout = LayoutInfo::managedLayout(core, parent);
            Q_ASSERT(layout != 0);

            // ### check if `info' is valid!

            switch (LayoutInfo::layoutType(core, layout)) {
                default: Q_ASSERT(0); break;

                case LayoutInfo::VBox:
                    insert_into_box_layout(static_cast<QBoxLayout*>(layout), info.top(), promoted);
                    break;

                case LayoutInfo::HBox:
                    insert_into_box_layout(static_cast<QBoxLayout*>(layout), info.left(), promoted);
                    break;

                case LayoutInfo::Grid:
                    add_to_grid_layout(static_cast<QGridLayout*>(layout), promoted, info.top(), info.left(), info.height(), info.width());
                    break;
            }
        }
    }
}

PromoteToCustomWidgetCommand::PromoteToCustomWidgetCommand
                                (QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QApplication::translate("Command", "Promote to custom widget"), formWindow)
{
    m_widget = 0;
    m_promoted = 0;
}

void PromoteToCustomWidgetCommand::init(QDesignerWidgetDataBaseItemInterface *item,
                                        QWidget *widget)
{
    m_widget = widget;
    m_promoted = new QDesignerPromotedWidget(item, widget->parentWidget());
}

void PromoteToCustomWidgetCommand::redo()
{
    m_promoted->setObjectName(QLatin1String("__qt__promoted_") + m_widget->objectName());
    m_promoted->setGeometry(m_widget->geometry());

    replace_widget_item(formWindow(), m_widget, m_promoted);

    m_promoted->setChildWidget(m_widget);
    formWindow()->manageWidget(m_promoted);

    formWindow()->clearSelection();
    formWindow()->selectWidget(m_promoted);
    m_promoted->show();
}

void PromoteToCustomWidgetCommand::undo()
{
    m_promoted->setChildWidget(0);
    m_widget->setParent(m_promoted->parentWidget());
    m_widget->setGeometry(m_promoted->geometry());

    replace_widget_item(formWindow(), m_promoted, m_widget);

    formWindow()->manageWidget(m_widget);
    formWindow()->unmanageWidget(m_promoted);

    m_promoted->hide();
    m_widget->show();

    formWindow()->clearSelection();
    formWindow()->selectWidget(m_promoted);
}

// ---- DemoteFromCustomWidgetCommand ----

DemoteFromCustomWidgetCommand::DemoteFromCustomWidgetCommand
                                    (QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QApplication::translate("Command", "Demote from custom widget"), formWindow)
{
    m_promote_cmd = new PromoteToCustomWidgetCommand(formWindow);
}

void DemoteFromCustomWidgetCommand::init(QDesignerPromotedWidget *promoted)
{
    m_promote_cmd->m_widget = promoted->child();
    m_promote_cmd->m_promoted = promoted;
}

void DemoteFromCustomWidgetCommand::redo()
{
    m_promote_cmd->undo();
    m_promote_cmd->m_widget->show();
}

void DemoteFromCustomWidgetCommand::undo()
{
    m_promote_cmd->redo();
}

// ---- LayoutCommand ----
LayoutCommand::LayoutCommand(QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QString(), formWindow)
{
}

LayoutCommand::~LayoutCommand()
{
    m_layout->deleteLater();
}

void LayoutCommand::init(QWidget *parentWidget, const QList<QWidget*> &widgets, LayoutInfo::Type layoutType,
        QWidget *layoutBase, bool splitter)
{
    m_parentWidget = parentWidget;
    m_widgets = widgets;
    formWindow()->simplifySelection(&m_widgets);
    QPoint grid = formWindow()->grid();
    QSize sz(qMax(5, grid.x()), qMax(5, grid.y()));

    switch (layoutType) {
        case LayoutInfo::Grid:
            m_layout = new GridLayout(widgets, m_parentWidget, formWindow(), layoutBase, sz);
            setText(QApplication::translate("Command", "Lay out using grid"));
            break;

        case LayoutInfo::VBox:
            m_layout = new VerticalLayout(widgets, m_parentWidget, formWindow(), layoutBase, splitter);
            setText(QApplication::translate("Command", "Lay out vertically"));
            break;

        case LayoutInfo::HBox:
            m_layout = new HorizontalLayout(widgets, m_parentWidget, formWindow(), layoutBase, splitter);
            setText(QApplication::translate("Command", "Lay out horizontally"));
            break;
        default:
            Q_ASSERT(0);
    }

    m_layout->setup();
}

void LayoutCommand::redo()
{
    m_layout->doLayout();
    checkSelection(m_parentWidget);
}

void LayoutCommand::undo()
{
    QDesignerFormEditorInterface *core = formWindow()->core();

    QWidget *lb = m_layout->layoutBaseWidget();
    QDesignerLayoutDecorationExtension *deco = qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), lb);

    QWidget *p = m_layout->parentWidget();
    if (!deco && hasLayout(p)) {
        deco = qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), p);
    }

    m_layout->undoLayout();
    delete deco; // release the extension

    // ### generalize (put in function)
    if (!m_layoutBase && lb != 0 && !(qobject_cast<QLayoutWidget*>(lb) || qobject_cast<QSplitter*>(lb))) {
        core->metaDataBase()->add(lb);
        lb->show();
    }

    checkSelection(m_parentWidget);
}

// ---- BreakLayoutCommand ----
BreakLayoutCommand::BreakLayoutCommand(QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QApplication::translate("Command", "Break layout"), formWindow)
{
}

BreakLayoutCommand::~BreakLayoutCommand()
{
}

void BreakLayoutCommand::init(const QList<QWidget*> &widgets, QWidget *layoutBase)
{
    QDesignerFormEditorInterface *core = formWindow()->core();

    m_widgets = widgets;
    m_layoutBase = core->widgetFactory()->containerOfWidget(layoutBase);
    m_layout = 0;

    QPoint grid = formWindow()->grid();

    LayoutInfo::Type lay = LayoutInfo::layoutType(core, m_layoutBase);
    if (lay == LayoutInfo::HBox)
        m_layout = new HorizontalLayout(widgets, m_layoutBase, formWindow(), m_layoutBase, qobject_cast<QSplitter*>(m_layoutBase) != 0);
    else if (lay == LayoutInfo::VBox)
        m_layout = new VerticalLayout(widgets, m_layoutBase, formWindow(), m_layoutBase, qobject_cast<QSplitter*>(m_layoutBase) != 0);
    else if (lay == LayoutInfo::Grid)
        m_layout = new GridLayout(widgets, m_layoutBase, formWindow(), m_layoutBase, QSize(qMax(5, grid.x()), qMax(5, grid.y())));
    // ### StackedLayout

    Q_ASSERT(m_layout != 0);

    m_layout->sort();

    m_margin = m_layout->margin();
    m_spacing = m_layout->spacing();
}

void BreakLayoutCommand::redo()
{
    if (!m_layout)
        return;

    QDesignerFormEditorInterface *core = formWindow()->core();
    QWidget *lb = m_layout->layoutBaseWidget();
    QDesignerLayoutDecorationExtension *deco = qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), lb);
    QWidget *p = m_layout->parentWidget();
    if (!deco && hasLayout(p))
        deco = qt_extension<QDesignerLayoutDecorationExtension*>(core->extensionManager(), p);

    formWindow()->clearSelection(false);
    m_layout->breakLayout();
    delete deco; // release the extension

    foreach (QWidget *widget, m_widgets) {
        widget->resize(widget->size().expandedTo(QSize(16, 16)));
    }
}

void BreakLayoutCommand::undo()
{
    if (!m_layout)
        return;

    formWindow()->clearSelection(false);
    m_layout->doLayout();

    if (m_layoutBase && m_layoutBase->layout()) {
        m_layoutBase->layout()->setSpacing(m_spacing);
        m_layoutBase->layout()->setMargin(m_margin);
    }
}

// ---- ToolBoxCommand ----
ToolBoxCommand::ToolBoxCommand(QDesignerFormWindowInterface *formWindow)
    : QDesignerFormWindowCommand(QString(), formWindow)
{
}

ToolBoxCommand::~ToolBoxCommand()
{
}

void ToolBoxCommand::init(QToolBox *toolBox)
{
    m_toolBox = toolBox;
    m_index = m_toolBox->currentIndex();
    m_widget = m_toolBox->widget(m_index);
    m_itemText = m_toolBox->itemText(m_index);
    m_itemIcon = m_toolBox->itemIcon(m_index);
}

void ToolBoxCommand::removePage()
{
    m_toolBox->removeItem(m_index);

    m_widget->hide();
    m_widget->setParent(formWindow());
}

void ToolBoxCommand::addPage()
{
    m_widget->setParent(m_toolBox);
    m_toolBox->insertItem(m_index, m_widget, m_itemIcon, m_itemText);
    m_toolBox->setCurrentIndex(m_index);

    m_widget->show();
}

// ---- MoveToolBoxPageCommand ----
MoveToolBoxPageCommand::MoveToolBoxPageCommand(QDesignerFormWindowInterface *formWindow)
    : ToolBoxCommand(formWindow)
{
}

MoveToolBoxPageCommand::~MoveToolBoxPageCommand()
{
}

void MoveToolBoxPageCommand::init(QToolBox *toolBox, QWidget *page, int newIndex)
{
    ToolBoxCommand::init(toolBox);
    setText(QApplication::translate("Command", "Move Page"));

    m_widget = page;
    m_oldIndex = m_toolBox->indexOf(m_widget);
    m_itemText = m_toolBox->itemText(m_oldIndex);
    m_itemIcon = m_toolBox->itemIcon(m_oldIndex);
    m_newIndex = newIndex;
}

void MoveToolBoxPageCommand::redo()
{
    m_toolBox->removeItem(m_oldIndex);
    m_toolBox->insertItem(m_newIndex, m_widget, m_itemIcon, m_itemText);
}

void MoveToolBoxPageCommand::undo()
{
    m_toolBox->removeItem(m_newIndex);
    m_toolBox->insertItem(m_oldIndex, m_widget, m_itemIcon, m_itemText);
}

// ---- DeleteToolBoxPageCommand ----
DeleteToolBoxPageCommand::DeleteToolBoxPageCommand(QDesignerFormWindowInterface *formWindow)
    : ToolBoxCommand(formWindow)
{
}

DeleteToolBoxPageCommand::~DeleteToolBoxPageCommand()
{
}

void DeleteToolBoxPageCommand::init(QToolBox *toolBox)