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/* This file is part of the KDE libraries
*
* Copyright (c) 2011 Aurélien Gâteau <agateau@kde.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef KMESSAGEWIDGET_H
#define KMESSAGEWIDGET_H
#include <kdeui_export.h>
#include <QFrame>
class KMessageWidgetPrivate;
/**
* @short A widget to provide feedback or propose opportunistic interactions.
*
* KMessageWidget can be used to provide inline positive or negative
* feedback, or to implement opportunistic interactions.
*
* As a feedback widget, KMessageWidget provides a less intrusive alternative
* to "OK Only" message boxes. If you do not need the modalness of KMessageBox,
* consider using KMessageWidget instead.
*
* <b>Negative feedback</b>
*
* The KMessageWidget can be used as a secondary indicator of failure: the
* first indicator is usually the fact the action the user expected to happen
* did not happen.
*
* Example: User fills a form, clicks "Submit".
*
* @li Expected feedback: form closes
* @li First indicator of failure: form stays there
* @li Second indicator of failure: a KMessageWidget appears on top of the
* form, explaining the error condition
*
* When used to provide negative feedback, KMessageWidget should be placed
* close to its context. In the case of a form, it should appear on top of the
* form entries.
*
* KMessageWidget should get inserted in the existing layout. Space should not
* be reserved for it, otherwise it becomes "dead space", ignored by the user.
* KMessageWidget should also not appear as an overlay to prevent blocking
* access to elements the user needs to interact with to fix the failure.
*
* <b>Positive feedback</b>
*
* KMessageWidget can be used for positive feedback but it shouldn't be
* overused. It is often enough to provide feedback by simply showing the
* results of an action.
*
* Examples of acceptable uses:
*
* @li Confirm success of "critical" transactions
* @li Indicate completion of background tasks
*
* Example of inadapted uses:
*
* @li Indicate successful saving of a file
* @li Indicate a file has been successfully removed
*
* <b>Opportunistic interaction</b>
*
* Opportunistic interaction is the situation where the application suggests to
* the user an action he could be interested in perform, either based on an
* action the user just triggered or an event which the application noticed.
*
* Example of acceptable uses:
*
* @li A browser can propose remembering a recently entered password
* @li A music collection can propose ripping a CD which just got inserted
* @li A chat application may notify the user a "special friend" just connected
*
* @author Aurélien Gâteau <agateau@kde.org>
* @since 4.7
*/
class KMessageWidget : public QFrame
{
Q_OBJECT
Q_ENUMS(MessageType)
Q_PROPERTY(QString text READ text WRITE setText)
Q_PROPERTY(bool wordWrap READ wordWrap WRITE setWordWrap)
Q_PROPERTY(bool closeButtonVisible READ isCloseButtonVisible WRITE setCloseButtonVisible)
Q_PROPERTY(MessageType messageType READ messageType WRITE setMessageType)
Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
public:
enum MessageType {
Positive,
Information,
Warning,
Error
};
/**
* Constructs a KMessageWidget with the specified parent.
*/
explicit KMessageWidget(QWidget *parent = 0);
explicit KMessageWidget(const QString &text, QWidget *parent = 0);
~KMessageWidget();
QString text() const;
bool wordWrap() const;
bool isCloseButtonVisible() const;
MessageType messageType() const;
void addAction(QAction *action);
void removeAction(QAction *action);
QSize sizeHint() const;
QSize minimumSizeHint() const;
int heightForWidth(int width) const;
/**
* The icon shown on the left of the text. By default, no icon is shown.
* @since 4.11
*/
QIcon icon() const;
public Q_SLOTS:
void setText(const QString &text);
void setWordWrap(bool wordWrap);
void setCloseButtonVisible(bool visible);
void setMessageType(KMessageWidget::MessageType type);
/**
* Show the widget using an animation, unless
* KGlobalSettings::graphicsEffectLevel() does not allow simple effects.
*/
void animatedShow();
/**
* Hide the widget using an animation, unless
* KGlobalSettings::graphicsEffectLevel() does not allow simple effects.
*/
void animatedHide();
/**
* Define an icon to be shown on the left of the text
* @since 4.11
*/
void setIcon(const QIcon &icon);
Q_SIGNALS:
/**
* This signal is emitted when the user clicks a link in the text label.
* The URL referred to by the href anchor is passed in contents.
* @param contents text of the href anchor
* @see QLabel::linkActivated()
* @since 4.10
*/
void linkActivated(const QString& contents);
/**
* This signal is emitted when the user hovers over a link in the text label.
* The URL referred to by the href anchor is passed in contents.
* @param contents text of the href anchor
* @see QLabel::linkHovered()
* @since 4.11
*/
void linkHovered(const QString& contents);
protected:
void paintEvent(QPaintEvent *event);
bool event(QEvent *event);
void resizeEvent(QResizeEvent *event);
void showEvent(QShowEvent *event);
private:
KMessageWidgetPrivate *const d;
friend class KMessageWidgetPrivate;
Q_PRIVATE_SLOT(d, void slotTimeLineChanged(qreal))
Q_PRIVATE_SLOT(d, void slotTimeLineFinished())
};
//---------------------------------------------------------------------
// KMessageWidgetPrivate
//---------------------------------------------------------------------
class QLabel;
class QToolButton;
class QTimeLine;
#include <QIcon>
class KMessageWidgetPrivate
{
public:
void init(KMessageWidget*);
KMessageWidget* q;
QFrame* content;
QLabel* iconLabel;
QLabel* textLabel;
QToolButton* closeButton;
QTimeLine* timeLine;
QIcon icon;
KMessageWidget::MessageType messageType;
bool wordWrap;
QList<QToolButton*> buttons;
QPixmap contentSnapShot;
void createLayout();
void updateSnapShot();
void updateLayout();
void slotTimeLineChanged(qreal);
void slotTimeLineFinished();
int bestContentHeight() const;
};
#endif /* KMESSAGEWIDGET_H */
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