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/*
 *  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 General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  2.010-1301, USA.
 */

import QtQuick 2.4
import QtQuick.Layouts 1.1
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import QtQuick.Window 2.2
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import QtGraphicalEffects 1.12
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import org.kde.taskmanager 0.1 as TaskManager
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import org.kde.plasma.plasmoid 2.0
import org.kde.plasma.core 2.0 as PlasmaCore
import org.kde.plasma.components 2.0 as PlasmaComponents
import org.kde.kquickcontrolsaddons 2.0

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import org.kde.plasma.private.nanoshell 2.0 as NanoShell

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PlasmaCore.ColorScope {
    id: root
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    width: 600
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    height: 480
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    colorGroup: showingApp ? PlasmaCore.Theme.NormalColorGroup : PlasmaCore.Theme.ComplementaryColorGroup
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    Plasmoid.backgroundHints: PlasmaCore.Types.NoBackground

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    readonly property bool showingApp: tasksModel.activeTask && tasksModel.activeTask.valid && !tasksModel.data(tasksModel.activeTask, TaskManager.AbstractTasksModel.IsFullScreen) || NanoShell.StartupFeedback.visible
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    property QtObject taskSwitcher: taskSwitcherLoader.item ? taskSwitcherLoader.item : null
    Loader {
        id: taskSwitcherLoader
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    }
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    //FIXME: why it crashes on startup if TaskSwitcher is loaded immediately?
    Timer {
        running: true
        interval: 200
        onTriggered: taskSwitcherLoader.source = Qt.resolvedUrl("TaskSwitcher.qml")
    }

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    TaskManager.TasksModel {
        id: tasksModel
        sortMode: TaskManager.TasksModel.SortVirtualDesktop
        groupMode: TaskManager.TasksModel.GroupDisabled

        screenGeometry: plasmoid.screenGeometry
        filterByScreen: plasmoid.configuration.showForCurrentScreenOnly

    }

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    MouseArea {
        id: mainMouseArea
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        anchors.fill: parent
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        property int oldMouseY: 0
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        property int startMouseY: 0
        property bool isDragging: false
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        drag.filterChildren: true
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        function managePressed(mouse) {
            startMouseY = oldMouseY = mouse.y;
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            taskSwitcher.offset = -taskSwitcher.height
        }
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        onPressed: managePressed(mouse);
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        onPositionChanged: {
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            if (!isDragging && Math.abs(startMouseY - oldMouseY) < root.height) {
                oldMouseY = mouse.y;
                return;
            } else {
                isDragging = true;
            }

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            taskSwitcher.offset = taskSwitcher.offset - (mouse.y - oldMouseY);
            oldMouseY = mouse.y;
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            if (taskSwitcher.visibility == Window.Hidden && taskSwitcher.offset > -taskSwitcher.height + units.gridUnit && taskSwitcher.tasksCount) {
                taskSwitcher.visible = true;
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            }
        }
        onReleased: {
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            if (!isDragging) {
                return;
            }

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            if (taskSwitcher.visibility == Window.Hidden) {
                return;
            }
            if (taskSwitcher.offset > -taskSwitcher.height/2) {
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                taskSwitcher.currentTaskIndex = -1
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                taskSwitcher.show();
            } else {
                taskSwitcher.hide();
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                taskSwitcher.setSingleActiveWindow(taskSwitcher.currentTaskIndex);
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            }
        }
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        DropShadow {
            anchors.fill: icons
            visible: !showinApp
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            cached: true
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            horizontalOffset: 0
            verticalOffset: 1
            radius: 4.0
            samples: 17
            color: Qt.rgba(0,0,0,0.8)
            source: icons
        }
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        Item {
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            id: icons
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            anchors.fill: parent
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            visible: plasmoid.configuration.PanelButtonsVisible
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/*
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            Rectangle {
                anchors.fill: parent
                color: root.backgroundColor
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                opacity: showingApp ? 1 : 0
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                Rectangle {
                    anchors {
                        left: parent.left
                        right: parent.right
                        top: parent.top
                    }
                    height: 1
                    color: PlasmaCore.ColorScope.textColor
                    opacity: 0.2
                }
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            }*/
            Rectangle {
                anchors.fill: parent
                gradient: Gradient {
                    GradientStop {
                        position: 0
                        color: showingApp ? PlasmaCore.ColorScope.backgroundColor : "transparent"
                    }
                    GradientStop {
                        position: 1
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                        color: showingApp ? PlasmaCore.ColorScope.backgroundColor : Qt.rgba(0, 0, 0, 0.05)
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                    }
                }
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            }
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            Button {
                anchors.left: parent.left
                height: parent.height
                width: parent.width/3
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                enabled: taskSwitcher && taskSwitcher.tasksCount > 0;
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                iconSource: "box"
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                onClicked: {
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                    plasmoid.nativeInterface.showDesktop = false;
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                    taskSwitcher.visible ? taskSwitcher.hide() : taskSwitcher.show();
                }
                onPressed: mainMouseArea.managePressed(mouse);
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                onPositionChanged: mainMouseArea.positionChanged(mouse);
                onReleased: mainMouseArea.released(mouse);
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            }
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            Button {
                id: showDesktopButton
                height: parent.height
                width: parent.width/3
                anchors.horizontalCenter: parent.horizontalCenter
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                iconSource: "start-here-kde"
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                enabled: taskSwitcher && taskSwitcher.tasksCount > 0
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                checkable: true
                onCheckedChanged: {
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                    taskSwitcher.hide();
                    plasmoid.nativeInterface.showDesktop = checked;
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                }
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                onPressed: mainMouseArea.managePressed(mouse);
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                onPositionChanged: mainMouseArea.positionChanged(mouse);
                onReleased: mainMouseArea.released(mouse);
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                Connections {
                    target: root.taskSwitcher
                    onCurrentTaskIndexChanged: {
                        if (root.taskSwitcher.currentTaskIndex < 0) {
                            showDesktopButton.checked = false;
                        }
                    }
                }
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            }
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            Button {
                height: parent.height
                width: parent.width/3
                anchors.right: parent.right
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                iconSource: "paint-none"
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                //FIXME:Qt.UserRole+9 is IsWindow Qt.UserRole+15 is IsClosable. We can't reach that enum from QML
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                enabled: plasmoid.nativeInterface.hasCloseableActiveWindow
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                onClicked: {
                    var index = taskSwitcher.model.activeTask;
                    if (index) {
                        taskSwitcher.model.requestClose(index);
                    }
                }
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                onPressed: mainMouseArea.managePressed(mouse);
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                onPositionChanged: mainMouseArea.positionChanged(mouse);
                onReleased: mainMouseArea.released(mouse);
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            }
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        }
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    }
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}