author | hgs |
Tue, 13 Jul 2010 22:03:02 +0300 | |
changeset 13 | 5168dbe2168a |
parent 6 | c3690ec91ef8 |
child 23 | e6ad4ef83b23 |
child 34 | ed14f46c0e55 |
permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (developer.feedback@nokia.com) |
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** |
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** This file is part of the HbCore module of the UI Extensions for Mobile. |
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** |
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** GNU Lesser General Public License Usage |
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** This file may be used under the terms of the GNU Lesser General Public |
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** License version 2.1 as published by the Free Software Foundation and |
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** appearing in the file LICENSE.LGPL included in the packaging of this file. |
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** Please review the following information to ensure the GNU Lesser General |
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** Public License version 2.1 requirements will be met: |
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** 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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** If you have questions regarding the use of this file, please contact |
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** Nokia at developer.feedback@nokia.com. |
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** |
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****************************************************************************/ |
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#include "hbtooltip.h" |
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#include "hbtooltiplabel_p.h" |
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#include "hbinstance.h" |
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#include "hbgraphicsscene.h" |
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#include "hbgraphicsscene_p.h" |
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#include <QGraphicsItem> |
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/*! |
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@stable |
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@hbcore |
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\class HbToolTip |
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\brief The HbToolTip class provides tool tips (balloon help) for any graphics item. |
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\mainclass |
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The tip is a short piece of text reminding the user of the |
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graphics item's function. |
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The simplest and most common way to set a graphics item's tool tip is by |
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calling its QGraphicsItem::setToolTip() function. |
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When a tooltip is currently on |
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display, isVisible() returns true and text() the currently visible |
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text. |
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By default the tool tip framework is responsible for showing and hiding the tool tips |
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on the scene. When the framework detects a long mouse press event it checks what is the |
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top most QGraphicsItem on the scene having non empty tooltip text under the press point and |
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sends an QGraphicsSceneHelpEvent to it. This makes it possible that QGraphicsItem derived |
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objects can implement their own tool tip showing logic. If the sent QGraphicsSceneHelpEvent |
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event is accepted by the QGraphicsItem object then framework does nothing. Otherwise it shows |
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the tool tip text with Qt::AlignTop alignment. |
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In rare cases QGraphicsItem derived classes can handle QGraphicsSceneHelpEvent to provide |
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custom tool tip showing logic. An example on how to get custom tooltip alignment |
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on a QGraphicsItem derived class. |
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\snippet{ultimatecodesnippet/ultimatecodesnippet.cpp,25} |
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\sa QGraphicsItem::toolTip, QAction::toolTip |
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*/ |
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/*! |
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\overload |
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This is analogous to calling HbToolTip::showText(\a text, \a item, |
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item->boundingRect(), \a preferredAlignment) |
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*/ |
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void HbToolTip::showText( const QString &text, QGraphicsItem *item, |
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Qt::Alignment preferredAlignment ) |
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{ |
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showText( text, item, item ? item->boundingRect() : QRectF(), preferredAlignment ); |
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} |
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/*! |
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Shows \a text as a tool tip, with the prefererred alignment \a preferredAlignment in relation |
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to \a item. |
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If you specify a non-empty rect the tip will be hidden as soon |
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as you move your cursor out of this area. |
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The \a rect is in the coordinates of the graphics item you specify with |
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\a item. |
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If \a text is empty or the item 0 the tool tip is hidden. |
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The supported alignment flags are Qt::AlignTop, Qt::AlignRight, Qt::AlignLeft, |
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Qt::AlignTop|Qt::AlignRight, Qt::AlignTop|Qt::AlignLeft. Any other alignment flags are ignored. |
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Alignment flags are referring to the side of \a item i.e. when \a preferredAlignment |
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equals Qt::AlignTop the tool tip is aligned to the top of \a item and so on. |
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When Qt::AlignTop|Qt::AlignLeft combination is used the bottom-right corner of the tool tip is |
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aligned to the top-left corner of \a item. When Qt::AlignTop|Qt::AlignRight combination is used |
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the bottom-left corner of the tool tip is aligned to the top-right corner of \a item. |
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HbToolTip uses QStyle::visualAlignment() to transforms \a preferredAlignment according to the |
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current layout direction. Qt::AlignAbsolute is supported the way is described |
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in QStyle::visualAlignment(). |
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104 |
|
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If the tool tip could not be aligned properly i.e. without intersecting \a item's bounding |
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rectangle by using the provided \a preferredAlignment then it will be aligned by another |
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supported alignment option. |
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108 |
|
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If none of the supported alignment options results proper alignment then Qt::AlignTop will |
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be used. |
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111 |
|
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112 |
*/ |
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void HbToolTip::showText( const QString &text, QGraphicsItem *item, const QRectF &rect, |
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Qt::Alignment preferredAlignment ) |
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115 |
{ |
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if (!item) { |
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return; |
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} |
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HbGraphicsScene *scene = qobject_cast<HbGraphicsScene *>( item->scene() ); |
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if ( scene && text.isEmpty() ) { // empty text means hide current tip |
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scene->d_ptr->mToolTip->hide(); |
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} else if (scene && scene->d_ptr->mToolTip) { |
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123 |
|
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scene->d_ptr->mToolTip->setText(text); |
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scene->d_ptr->mToolTip->setRect( item->mapRectToScene(rect) ); |
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scene->d_ptr->mToolTip->showText( item, preferredAlignment ); |
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} |
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} |
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129 |
|
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130 |
/*! |
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\fn void HbToolTip::hideText() |
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132 |
|
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Hides the visible tooltip in the \a scene. This is the same as calling showText() with an |
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empty string or item parameter as 0. |
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135 |
|
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\sa showText() |
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*/ |
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void HbToolTip::hideText( HbGraphicsScene *scene ) |
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139 |
{ |
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if ( scene && scene->d_ptr->mToolTip) { |
6
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if (scene->d_ptr->mToolTip->isVisible()) { |
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scene->d_ptr->mToolTip->hide(); |
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} else { |
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//reset tooltip timers |
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scene->d_ptr->mToolTip->hideTextImmediately(); |
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} |
0
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} |
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} |
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149 |
|
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150 |
/*! |
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Returns true if this tooltip is currently shown. |
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152 |
|
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\sa showText() |
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*/ |
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bool HbToolTip::isVisible( const HbGraphicsScene *scene ) |
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{ |
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if ( scene && scene->d_ptr->mToolTip ) { |
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return scene->d_ptr->mToolTip->isVisible(); |
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} else { |
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return false; |
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} |
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} |
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163 |
|
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/*! |
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Returns the tooltip text, if a tooltip is visible, or an |
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empty string if a tooltip is not visible. |
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*/ |
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QString HbToolTip::text( const HbGraphicsScene *scene ) |
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{ |
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if ( HbToolTip::isVisible(scene) ) { |
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return scene->d_ptr->mToolTip->text(); |
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} |
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return QString(); |
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} |