293 lines
11 KiB
C
293 lines
11 KiB
C
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/****************************************************************************
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**
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Designer of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial Usage
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Nokia.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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//
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// W A R N I N G
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// -------------
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//
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// This file is not part of the Qt API. It exists for the convenience
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// of Qt Designer. This header
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// file may change from version to version without notice, or even be removed.
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//
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// We mean it.
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//
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#ifndef QLAYOUT_WIDGET_H
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#define QLAYOUT_WIDGET_H
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#include "shared_global_p.h"
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#include <QtDesigner/QDesignerLayoutDecorationExtension>
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#include <QtCore/QPointer>
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#include <QtCore/QVariant>
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#include <QtGui/QWidget>
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#include <QtGui/QLayout>
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QT_BEGIN_NAMESPACE
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class QDesignerFormWindowInterface;
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class QDesignerFormEditorInterface;
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class QGridLayout;
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class QFormLayout;
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namespace qdesigner_internal {
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// ---- LayoutProperties: Helper struct that stores all layout-relevant properties
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// with functions to retrieve and apply to property sheets. Can be used to store the state
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// for undo commands and while rebuilding layouts.
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struct QDESIGNER_SHARED_EXPORT LayoutProperties
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{
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LayoutProperties();
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void clear();
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enum Margins { LeftMargin, TopMargin, RightMargin, BottomMargin, MarginCount };
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enum Spacings { Spacing, HorizSpacing, VertSpacing, SpacingsCount };
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enum PropertyMask {
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ObjectNameProperty = 0x1,
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LeftMarginProperty = 0x2, TopMarginProperty = 0x4, RightMarginProperty = 0x8, BottomMarginProperty = 0x10,
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SpacingProperty = 0x20, HorizSpacingProperty = 0x40, VertSpacingProperty = 0x80,
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SizeConstraintProperty = 0x100,
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FieldGrowthPolicyProperty = 0x200, RowWrapPolicyProperty = 0x400, LabelAlignmentProperty = 0x0800, FormAlignmentProperty = 0x1000,
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BoxStretchProperty = 0x2000, GridRowStretchProperty = 0x4000, GridColumnStretchProperty = 0x8000,
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GridRowMinimumHeightProperty = 0x10000, GridColumnMinimumWidthProperty = 0x20000,
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AllProperties = 0xFFFF};
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// return a PropertyMask of visible properties
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static int visibleProperties(const QLayout *layout);
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// Retrieve from /apply to sheet: A property mask is returned indicating the properties found in the sheet
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int fromPropertySheet(const QDesignerFormEditorInterface *core, QLayout *l, int mask = AllProperties);
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int toPropertySheet(const QDesignerFormEditorInterface *core, QLayout *l, int mask = AllProperties, bool applyChanged = true) const;
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int m_margins[MarginCount];
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bool m_marginsChanged[MarginCount];
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int m_spacings[SpacingsCount];
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bool m_spacingsChanged[SpacingsCount];
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QVariant m_objectName; // receives a PropertySheetStringValue
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bool m_objectNameChanged;
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QVariant m_sizeConstraint;
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bool m_sizeConstraintChanged;
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bool m_fieldGrowthPolicyChanged;
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QVariant m_fieldGrowthPolicy;
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bool m_rowWrapPolicyChanged;
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QVariant m_rowWrapPolicy;
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bool m_labelAlignmentChanged;
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QVariant m_labelAlignment;
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bool m_formAlignmentChanged;
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QVariant m_formAlignment;
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bool m_boxStretchChanged;
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QVariant m_boxStretch;
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bool m_gridRowStretchChanged;
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QVariant m_gridRowStretch;
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bool m_gridColumnStretchChanged;
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QVariant m_gridColumnStretch;
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bool m_gridRowMinimumHeightChanged;
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QVariant m_gridRowMinimumHeight;
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bool m_gridColumnMinimumWidthChanged;
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QVariant m_gridColumnMinimumWidth;
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};
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// -- LayoutHelper: For use with the 'insert widget'/'delete widget' command,
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// able to store and restore states.
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// This could become part of 'QDesignerLayoutDecorationExtensionV2',
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// but to keep any existing old extensions working, it is provided as
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// separate class with a factory function.
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class LayoutHelper {
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protected:
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LayoutHelper();
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public:
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virtual ~LayoutHelper();
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static LayoutHelper *createLayoutHelper(int type);
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static int indexOf(const QLayout *lt, const QWidget *widget);
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// Return area of an item (x == columns)
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QRect itemInfo(QLayout *lt, const QWidget *widget) const;
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virtual QRect itemInfo(QLayout *lt, int index) const = 0;
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virtual void insertWidget(QLayout *lt, const QRect &info, QWidget *w) = 0;
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virtual void removeWidget(QLayout *lt, QWidget *widget) = 0;
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// Since 4.5: The 'morphing' feature requires an API for replacing widgets on layouts.
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virtual void replaceWidget(QLayout *lt, QWidget *before, QWidget *after) = 0;
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// Simplify a grid, remove empty columns, rows within the rectangle
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// The DeleteWidget command restricts the area to be simplified.
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virtual bool canSimplify(const QDesignerFormEditorInterface *core, const QWidget *widgetWithManagedLayout, const QRect &restrictionArea) const = 0;
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virtual void simplify(const QDesignerFormEditorInterface *core, QWidget *widgetWithManagedLayout, const QRect &restrictionArea) = 0;
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// Push and pop a state. Can be used for implementing undo for
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// simplify/row, column insertion commands, provided that
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// the widgets remain the same.
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virtual void pushState(const QDesignerFormEditorInterface *core, const QWidget *widgetWithManagedLayout) = 0;
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virtual void popState(const QDesignerFormEditorInterface *core, QWidget *widgetWithManagedLayout) = 0;
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};
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// Base class for layout decoration extensions.
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class QDESIGNER_SHARED_EXPORT QLayoutSupport: public QObject, public QDesignerLayoutDecorationExtension
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{
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Q_OBJECT
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Q_INTERFACES(QDesignerLayoutDecorationExtension)
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protected:
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QLayoutSupport(QDesignerFormWindowInterface *formWindow, QWidget *widget, LayoutHelper *helper, QObject *parent = 0);
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public:
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virtual ~QLayoutSupport();
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inline QDesignerFormWindowInterface *formWindow() const { return m_formWindow; }
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// DecorationExtension V2
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LayoutHelper* helper() const { return m_helper; }
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// DecorationExtension
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virtual int currentIndex() const { return m_currentIndex; }
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virtual InsertMode currentInsertMode() const { return m_currentInsertMode; }
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virtual QPair<int, int> currentCell() const { return m_currentCell; }
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virtual int findItemAt(const QPoint &pos) const;
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virtual int indexOf(QWidget *widget) const;
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virtual int indexOf(QLayoutItem *item) const;
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virtual void adjustIndicator(const QPoint &pos, int index);
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virtual QList<QWidget*> widgets(QLayout *layout) const;
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// Pad empty cells with dummy spacers. Called by layouting commands.
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static void createEmptyCells(QGridLayout *gridLayout);
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// remove dummy spacers in the area. Returns false if there are non-empty items in the way
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static bool removeEmptyCells(QGridLayout *gridLayout, const QRect &area);
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static void createEmptyCells(QFormLayout *formLayout); // ditto.
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static bool removeEmptyCells(QFormLayout *formLayout, const QRect &area);
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// grid helpers: find item index
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static int findItemAt(QGridLayout *, int row, int column);
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// grid helpers: Quick check whether simplify should be enabled for grids. May return false positives.
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static bool canSimplifyQuickCheck(const QGridLayout *);
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static bool canSimplifyQuickCheck(const QFormLayout *fl);
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// Factory function, create layout support according to layout type of widget
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static QLayoutSupport *createLayoutSupport(QDesignerFormWindowInterface *formWindow, QWidget *widget, QObject *parent = 0);
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protected:
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// figure out insertion position and mode from indicator on empty cell if supported
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virtual void setCurrentCellFromIndicatorOnEmptyCell(int index) = 0;
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// figure out insertion position and mode from indicator
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virtual void setCurrentCellFromIndicator(Qt::Orientation indicatorOrientation, int index, int increment) = 0;
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// Overwrite to return the extended geometry of an item, that is,
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// if it is a border item, include the widget border for the indicator to work correctly
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virtual QRect extendedGeometry(int index) const = 0;
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virtual bool supportsIndicatorOrientation(Qt::Orientation indicatorOrientation) const = 0;
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QRect itemInfo(int index) const;
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QLayout *layout() const;
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QGridLayout *gridLayout() const;
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QWidget *widget() const { return m_widget; }
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void setInsertMode(InsertMode im);
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void setCurrentCell(const QPair<int, int> &cell);
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private:
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enum Indicator { LeftIndicator, TopIndicator, RightIndicator, BottomIndicator, NumIndicators };
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void hideIndicator(Indicator i);
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void showIndicator(Indicator i, const QRect &geometry, const QPalette &);
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QDesignerFormWindowInterface *m_formWindow;
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LayoutHelper* m_helper;
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QPointer<QWidget> m_widget;
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QPointer<QWidget> m_indicators[NumIndicators];
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int m_currentIndex;
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InsertMode m_currentInsertMode;
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QPair<int, int> m_currentCell;
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};
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} // namespace qdesigner_internal
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// Red layout widget.
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class QDESIGNER_SHARED_EXPORT QLayoutWidget: public QWidget
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{
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Q_OBJECT
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public:
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explicit QLayoutWidget(QDesignerFormWindowInterface *formWindow, QWidget *parent = 0);
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int layoutLeftMargin() const;
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void setLayoutLeftMargin(int layoutMargin);
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int layoutTopMargin() const;
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void setLayoutTopMargin(int layoutMargin);
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int layoutRightMargin() const;
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void setLayoutRightMargin(int layoutMargin);
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int layoutBottomMargin() const;
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void setLayoutBottomMargin(int layoutMargin);
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inline QDesignerFormWindowInterface *formWindow() const { return m_formWindow; }
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protected:
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virtual bool event(QEvent *e);
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virtual void paintEvent(QPaintEvent *e);
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private:
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QDesignerFormWindowInterface *m_formWindow;
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int m_leftMargin;
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int m_topMargin;
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int m_rightMargin;
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int m_bottomMargin;
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};
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QT_END_NAMESPACE
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#endif // QDESIGNER_WIDGET_H
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