Page.qml

/*
 *   Copyright 2015 Marco Martin <mart@kde.org>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Library General Public License as
 *   published by the Free Software Foundation; either version 2, or
 *   (at your option) any later version.
 *
 *   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 Library General Public License for more details
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this program; if not, write to the
 *   Free Software Foundation, Inc.,
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

import QtQuick 2.5
import QtQuick.Layouts 1.2
import org.kde.kirigami 2.7 as Kirigami
import "private"
import QtQuick.Templates 2.0 as T2

T2.Page {
    id: root

    leftPadding: Kirigami.Units.gridUnit

    topPadding: Kirigami.Units.gridUnit

    rightPadding: Kirigami.Units.gridUnit

    bottomPadding: actionButtons.item ? actionButtons.height : Kirigami.Units.gridUnit

    property Flickable flickable

    //TODO: remove
    property alias contextualActions: actionsGroup.contextualActions

    //TODO: remove
    property alias mainAction: actionsGroup.main

    //TODO: remove
    property alias leftAction: actionsGroup.left

    //TODO: remove
    property alias rightAction: actionsGroup.right

    readonly property alias actions: actionsGroup

    signal contextualActionsAboutToShow

    readonly property bool isCurrentPage: typeof applicationWindow === "undefined" || !globalToolBar.row
                ? true
                : (globalToolBar.row.layers.depth > 1
                    ? globalToolBar.row.layers.currentItem === root
                    : globalToolBar.row.currentItem === root)

    readonly property alias overlay: overlayItem

    property Component titleDelegate: Kirigami.Heading {
        id: title
        level: 1
        Layout.fillWidth: true

        Layout.preferredWidth: titleTextMetrics.width
        Layout.minimumWidth: titleTextMetrics.width
        opacity: root.isCurrentPage ? 1 : 0.4
        maximumLineCount: 1
        elide: Text.ElideRight
        text: root.title
        TextMetrics {
            id: titleTextMetrics
            text: root.title
            font: title.font
        }
    }

    signal backRequested(var event);


    // Look for sheets and cose them
    //FIXME: port Sheets to Popup?
    onBackRequested: {
        for(var i in root.resources) {
            var item = root.resources[i];
            if (item.hasOwnProperty("close") && item.hasOwnProperty("sheetOpen") && item.sheetOpen) {
                item.close()
                event.accepted = true;
                return;
            }
        }
    }

    readonly property Item globalToolBarItem: globalToolBar.item

    property int globalToolBarStyle: {
        if (globalToolBar.row && !globalToolBar.stack) {
            return globalToolBar.row.globalToolBar.actualStyle;
        } else if (globalToolBar.stack) {
            return Kirigami.Settings.isMobile ? Kirigami.ApplicationHeaderStyle.Titles : Kirigami.ApplicationHeaderStyle.ToolBar;
        } else {
            return Kirigami.ApplicationHeaderStyle.None;
        }
    }

    //NOTE: contentItem will be created if not existing (and contentChildren of Page would become its children) This with anchors enforces the geometry we want, where globalToolBar is a super-header, on top of header
    contentItem: Item {
        anchors {
            top: root.header
                    ? root.header.bottom
                    : (globalToolBar.visible ? globalToolBar.bottom : parent.top)
            topMargin: root.topPadding + root.spacing
            bottom: root.footer ? root.footer.top : parent.bottom
            bottomMargin: root.bottomPadding + root.spacing
        }
    }

    background: Rectangle {
        color: Kirigami.Theme.backgroundColor
    }


    //FIXME: on material the shadow would bleed over
    clip: root.header != null;

    onHeaderChanged: {
        if (header) {
            header.anchors.top = Qt.binding(function() {return globalToolBar.visible ? globalToolBar.bottom : root.top});
        }
    }

    Component.onCompleted: {
        headerChanged();
        parentChanged(root.parent);
    }
    onParentChanged: {
        if (!parent) {
            return;
        }
        globalToolBar.stack = null;
        globalToolBar.row = null;

        if (root.Kirigami.ColumnView.view) {
            globalToolBar.row = root.Kirigami.ColumnView.view.__pageRow;
        }
        if (root.T2.StackView.view) {
            globalToolBar.stack = root.T2.StackView.view;
            globalToolBar.row = root.T2.StackView.view ? root.T2.StackView.view.parent : null;
        }
        if (globalToolBar.row) {
            root.globalToolBarStyleChanged.connect(globalToolBar.syncSource);
            globalToolBar.syncSource();
        }
    }

    //in data in order for them to not be considered for contentItem, contentChildren, contentData
    data: [
        PageActionPropertyGroup {
            id: actionsGroup
        },

        Item {
            id: overlayItem
            parent: root
            z: 9997
            anchors.fill: parent
        },
        //global top toolbar if we are in a PageRow (in the row or as a layer)
        Loader {
            id: globalToolBar
            z: 9999
            height: item ? item.implicitHeight : 0
            anchors {
                left:  parent.left
                right: parent.right
                top: parent.top
            }
            property Kirigami.PageRow row
            property T2.StackView stack

            visible: active
            active: (row || stack) && (root.globalToolBarStyle === Kirigami.ApplicationHeaderStyle.ToolBar || root.globalToolBarStyle == Kirigami.ApplicationHeaderStyle.Titles)

            function syncSource() {
                if (row && active) {
                    setSource(Qt.resolvedUrl(root.globalToolBarStyle === Kirigami.ApplicationHeaderStyle.ToolBar ? "private/globaltoolbar/ToolBarPageHeader.qml" : "private/globaltoolbar/TitlesPageHeader.qml"),
                    //TODO: find container reliably, remove assumption
                    {"pageRow": Qt.binding(function() {return row}),
                    "page": root,
                    "current": Qt.binding(function() {return stack || row.currentIndex === root.Kirigami.ColumnView.level})});
                }
            }
        },
        //bottom action buttons
        Loader {
            id: actionButtons
            z: 9999
            parent: root
            anchors {
                left: parent.left
                right: parent.right
                bottom: parent.bottom
            }
            //It should be T2.Page, Qt 5.7 doesn't like it
            property Item page: root
            height: item ? item.height : 0
            active: typeof applicationWindow !== "undefined" && (!globalToolBar.row || root.globalToolBarStyle !== Kirigami.ApplicationHeaderStyle.ToolBar) &&
                //Legacy
                    (typeof applicationWindow === "undefined" ||
                    (!applicationWindow().header || applicationWindow().header.toString().indexOf("ToolBarApplicationHeader") === -1) &&
                    (!applicationWindow().footer || applicationWindow().footer.toString().indexOf("ToolBarApplicationHeader") === -1))
            source: Qt.resolvedUrl("./private/ActionButton.qml")
        }
    ]

    Layout.fillWidth: true
}