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/*
* Copyright 2013 Canonical Ltd.
*
* This program 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; version 3.
*
* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
*
* Author: Zsombor Egri <zsombor.egri@canonical.com>
*/
#define foreach Q_FOREACH
#include <private/qqmlbinding_p.h>
#undef foreach
#include "ulconditionallayout.h"
#include "ulconditionallayout_p.h"
#include "ullayouts.h"
#include "ullayouts_p.h"
ULConditionalLayoutPrivate::ULConditionalLayoutPrivate(ULConditionalLayout *qq) :
q_ptr(qq),
when(0),
component(0)
{
}
ULLayouts *ULConditionalLayoutPrivate::layouts()
{
Q_Q(ULConditionalLayout);
return qobject_cast<ULLayouts*>(q->parent());
}
/*!
* \qmltype ConditionalLayout
* \instantiates ULConditionalLayout
* \inqmlmodule Ubuntu.Layouts 1.0
* \ingroup ubuntu-layouts
* \brief ConditionalLayout defines the layout of a given form factor.
*
* ConditionalLayout is a non-visual element defining the actual layout to be applied
* when a given condition evaluates to true. The condition can be any valid boolean
* JavaScript expression.
*
* As Layouts can be nested, it is recommended to choose properties of the Layouts item,
* often width and height, when defining the condition. Other elements like Screen
* orientation can also be used to define the layout activation condition.
*
* There must be only a single component defined in the ConditionalLayout which will be
* instantiated upon activation.
*
* Each conditional layout must be named with a string, which identifies the layout
* when activated.
*
* \qml
* Layouts {
* id: layouts
* width: units.gu(40)
* height: units.gu(40)
* layouts: [
* ConditionalLayout {
* name: "flow"
* when: layouts.width > units.gu(60)
* Flow {
* anchors.fill: parent
* spacing: units.dp(3)
* flow: Flow.LeftToRight
* ItemLayout {
* item: "item1"
* width: units.gu(30)
* height: units.gu(20)
* }
* ItemLayout {
* item: "item2"
* width: units.gu(30)
* height: units.gu(20)
* }
* ItemLayout {
* item: "item3"
* width: units.gu(30)
* height: units.gu(20)
* }
* }
* }
* ]
*
* Column {
* spacing: units.dp(2)
* Button {
* text: "Button #1"
* Layouts.item: "item1"
* }
* Button {
* text: "Button #2"
* Layouts.item: "item2"
* }
* Button {
* text: "Button #3"
* Layouts.item: "item3"
* }
* }
* }
* \endqml
*
* All Items to be managed by the Layouts engine must identify themselves by setting
* the Layouts.item attached property to a unique name (string). These unique names
* are then used by the ItemLayout component, so can apply the new layout to the
* correct Item.
*
* \sa {ItemLayout}
*/
ULConditionalLayout::ULConditionalLayout(QObject *parent) :
QObject(parent),
d_ptr(new ULConditionalLayoutPrivate(this))
{
}
ULConditionalLayout::~ULConditionalLayout()
{
}
/*!
* \qmlproperty string ConditionalLayout::name
* This property defines the name of the layout. Within the definition of Layouts,
* these names should be unique for each layout.
* \sa Layouts
*/
QString ULConditionalLayout::layoutName() const
{
Q_D(const ULConditionalLayout);
return d->name;
}
void ULConditionalLayout::setLayoutName(const QString &name)
{
Q_D(ULConditionalLayout);
if (name == d->name) {
return;
}
d->name = name;
}
/*!
* \qmlproperty bool ConditionalLayout::when
* This property defines the condition that when evaluating to true, chooses this
* ConditionalLayout to become the active layout.
* When two ConditionalLayouts \b when condition is evaluated to true, the first
* one declared in the layouts list is chosen.
*/
QQmlBinding *ULConditionalLayout::when() const
{
Q_D(const ULConditionalLayout);
return d->when;
}
void ULConditionalLayout::setWhen(QQmlBinding *when)
{
Q_D(ULConditionalLayout);
d->when = when;
// re-layout
ULLayouts *layouts = qobject_cast<ULLayouts*>(parent());
if (layouts) {
layouts->d_ptr->updateLayout();
}
}
/*!
* \qmlproperty Component ConditionalLayout::layout
* \default
* Default property holding the definition component of the layout. The component
* will be instantiated once the condition evaluates to true.
*/
QQmlComponent *ULConditionalLayout::layout() const
{
Q_D(const ULConditionalLayout);
return d->component;
}
void ULConditionalLayout::setLayout(QQmlComponent *component)
{
Q_D(ULConditionalLayout);
d->component = component;
}
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