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// (c) Evgenij Legotskoj https://evileg.com/en/post/192/
// a reimplementation of Drawer to workaround a problem with overlays
// in the Qt version packaged with the snaps.
import QtQuick 2.5
import QtQuick.Window 2.0
Rectangle {
id: panel
function show() {
open = true;
drawerOn = true;
}
function hide() {
open = false;
drawerOn = false;
}
function toggle() {
open = open ? false : true;
drawerOn = open;
}
property bool open: false
property int position: Qt.LeftEdge
readonly property bool _rightEdge: position === Qt.RightEdge
readonly property int _closeX: _rightEdge ? _rootItem.width : - panel.width
readonly property int _openX: _rightEdge ? _rootItem.width - width : 0
readonly property int _minimumX: _rightEdge ? _rootItem.width - panel.width : -panel.width
readonly property int _maximumX: _rightEdge ? _rootItem.width : 0
readonly property int _pullThreshold: panel.width/2
readonly property int _slideDuration: 260
readonly property int _openMarginSize: 20
property real _velocity: 0
property real _oldMouseX: -1
property Item _rootItem: parent
on_RightEdgeChanged: _setupAnchors()
onOpenChanged: completeSlideDirection()
width: Math.min(root.width, root.height) / 3 * 2
height: root.height
x: _closeX
z: 10
function _setupAnchors() {
_rootItem = parent;
shadow.anchors.right = undefined;
shadow.anchors.left = undefined;
mouse.anchors.left = undefined;
mouse.anchors.right = undefined;
if (_rightEdge) {
mouse.anchors.right = mouse.parent.right;
shadow.anchors.right = panel.left;
} else {
mouse.anchors.left = mouse.parent.left;
shadow.anchors.left = panel.right;
}
slideAnimation.enabled = false;
panel.x = _rightEdge ? _rootItem.width : - panel.width;
slideAnimation.enabled = true;
}
function completeSlideDirection() {
if (open) {
panel.x = _openX;
} else {
panel.x = _closeX;
Qt.inputMethod.hide();
}
}
function handleRelease() {
var velocityThreshold = 5
if ((_rightEdge && _velocity > velocityThreshold) ||
(!_rightEdge && _velocity < -velocityThreshold)) {
panel.open = false;
completeSlideDirection()
} else if ((_rightEdge && _velocity < -velocityThreshold) ||
(!_rightEdge && _velocity > velocityThreshold)) {
panel.open = true;
completeSlideDirection()
} else if ((_rightEdge && panel.x < _openX + _pullThreshold) ||
(!_rightEdge && panel.x > _openX - _pullThreshold) ) {
panel.open = true;
panel.x = _openX;
} else {
panel.open = false;
panel.x = _closeX;
}
}
function handleClick(mouse) {
if ((_rightEdge && mouse.x < panel.x ) || mouse.x > panel.width) {
open = false;
drawerOn = false;
}
}
onPositionChanged: {
if (!(position === Qt.RightEdge || position === Qt.LeftEdge )) {
console.warn("SlidePanel: Unsupported position.")
}
}
Behavior on x {
id: slideAnimation
enabled: !mouse.drag.active
NumberAnimation {
duration: _slideDuration
easing.type: Easing.OutCubic
}
}
NumberAnimation on x {
id: holdAnimation
to: _closeX + (_openMarginSize * (_rightEdge ? -1 : 1))
running : false
easing.type: Easing.OutCubic
duration: 200
}
MouseArea {
id: mouse
parent: _rootItem
y: _rootItem.y
width: open ? _rootItem.width : _openMarginSize
height: _rootItem.height
onPressed: if (!open) holdAnimation.restart();
onClicked: handleClick(mouse)
drag.target: panel
drag.minimumX: _minimumX
drag.maximumX: _maximumX
drag.axis: Qt.Horizontal
drag.onActiveChanged: if (active) holdAnimation.stop()
onReleased: handleRelease()
z: open ? 1 : 0
onMouseXChanged: {
_velocity = (mouse.x - _oldMouseX);
_oldMouseX = mouse.x;
}
}
Rectangle {
id: backgroundBlackout
parent: _rootItem
anchors.fill: parent
opacity: 0.5 * Math.min(1, Math.abs(panel.x - _closeX) / _rootItem.width/2)
color: "black"
}
Item {
id: shadow
anchors.left: panel.right
anchors.leftMargin: _rightEdge ? 0 : 10
height: parent.height
Rectangle {
height: 10
width: panel.height
rotation: 90
opacity: Math.min(1, Math.abs(panel.x - _closeX)/ _openMarginSize)
transformOrigin: Item.TopLeft
gradient: Gradient{
GradientStop { position: _rightEdge ? 1 : 0 ; color: "#00000000"}
GradientStop { position: _rightEdge ? 0 : 1 ; color: "#2c000000"}
}
}
}
}
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