/usr/share/rocsgraphtheory/qml/Scene.qml is in rocs 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
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* Copyright 2014-2015 Andreas Cord-Landwehr <cordlandwehr@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) version 3, or any
* later version accepted by the membership of KDE e.V. (or its
* successor approved by the membership of KDE e.V.), which shall
* act as a proxy defined in Section 6 of version 3 of the license.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
import QtQuick 2.1
import QtQuick.Controls 1.3
import QtQuick.Layouts 1.0
import QtQuick.Dialogs 1.0
import QtQml.StateMachine 1.0 as DSM
import org.kde.rocs.graphtheory 1.0
Item {
id: root
width: 800
height: 600
focus: true
// element create/remove actions
signal createNode(real x, real y, int typeIndex);
signal createEdge(Node from, Node to, int typeIndex);
signal deleteNode(Node node);
signal deleteEdge(Edge edge);
// exec dialog signals
signal showNodePropertiesDialog(Node node);
signal showEdgePropertiesDialog(Edge edge);
Connections {
target: selectMoveAction
onToggled: {
dsmSelectMove.running = selectMoveAction.checked
}
}
Connections {
target: addEdgeAction
onToggled: {
dsmCreateEdge.running = addEdgeAction.checked
}
}
Keys.onPressed: {
switch(event.key) {
case Qt.Key_Escape:
scene.clearSelection();
event.accepted = true;
break;
case Qt.Key_Delete:
scene.deleteSelected()
event.accepted = true;
break;
case Qt.Key_A: //CTRL+A
if (event.modifiers & Qt.ControlModifier) {
scene.selectAll();
event.accepted = true;
}
break;
default:
break;
}
}
ExclusiveGroup {
id: editToolButton
}
ColumnLayout {
id: toolbar
ToolButton {
action: SelectMoveAction {
id: selectMoveAction
exclusiveGroup: editToolButton
checked: true
}
}
ToolButton {
action: AddNodeAction {
id: addNodeAction
exclusiveGroup: editToolButton
}
}
ToolButton {
action: AddEdgeAction {
id: addEdgeAction
exclusiveGroup: editToolButton
onCreateEdge: root.createEdge(from, to, edgeTypeSelector.currentIndex)
}
}
ToolButton {
action: DeleteAction {
id: deleteAction
exclusiveGroup: editToolButton
}
}
}
ScrollView {
id: sceneScrollView
width: root.width - toolbar.width - 20
height: root.height
anchors {
left: toolbar.right
leftMargin: 10
}
Rectangle { // white background
color: "white"
width: parent.width
height: parent.height
}
Item {
id: scene
width: sceneScrollView.width - 30
height: sceneScrollView.height - 20
z: -10 // must lie behind everything else
property variant origin: Qt.point(0, 0) // coordinate of global origin (0,0) in scene
signal deleteSelected();
signal startMoveSelected();
signal finishMoveSelected();
signal updateSelection();
signal createEdgeUpdateFromNode();
signal createEdgeUpdateToNode();
function clearSelection()
{
selectionRect.from = Qt.point(0, 0)
selectionRect.to = Qt.point(0, 0)
updateSelection();
}
function setEdgeFromNode()
{
addEdgeAction.to = null
createEdgeUpdateFromNode();
}
function selectAll()
{
selectionRect.from = Qt.point(0, 0)
selectionRect.to = Qt.point(width,height)
updateSelection();
}
MouseArea {
id: sceneAction
anchors.fill: parent
z: -10 // must lie behind everything else
property variant lastMouseClicked: Qt.point(0, 0)
property variant lastMousePressed: Qt.point(0, 0)
property variant lastMouseReleased: Qt.point(0, 0)
property variant lastMousePosition: Qt.point(0, 0)
property bool nodePressed: false // if true, the current mouse-press event started at a node
onClicked: {
lastMouseClicked = Qt.point(mouse.x, mouse.y)
if (addNodeAction.checked) {
mouse.accepted = true
createNode(mouse.x + scene.origin.x, mouse.y + scene.origin.y, nodeTypeSelector.currentIndex);
return
}
}
onPressed: {
lastMousePressed = Qt.point(mouse.x, mouse.y)
lastMousePosition = Qt.point(mouse.x, mouse.y)
}
onPositionChanged: {
lastMousePosition = Qt.point(mouse.x, mouse.y)
}
onReleased: {
lastMouseReleased = Qt.point(mouse.x, mouse.y)
sceneAction.nodePressed = false
}
}
SelectionRectangle {
id: selectionRect
visible: false
}
Line {
id: createLineMarker
visible: false
fromX: sceneAction.lastMousePressed.x
fromY: sceneAction.lastMousePressed.y
toX: sceneAction.lastMousePosition.x
toY: sceneAction.lastMousePosition.y
}
Repeater {
model: edgeModel
EdgeItem {
id: edgeItem
edge: model.dataRole
origin: scene.origin
z: -1 // edges must be below nodes
EdgePropertyItem {
anchors.centerIn: parent
edge: model.dataRole
}
MouseArea {
anchors.fill: parent
propagateComposedEvents: true
onPressed: {
if (deleteAction.checked) {
deleteEdge(edge)
mouse.accepted = true
}
}
onDoubleClicked: {
showEdgePropertiesDialog(edgeItem.edge);
}
}
}
}
Repeater {
model: nodeModel
NodeItem {
id: nodeItem
node: model.dataRole
origin: scene.origin
highlighted: addEdgeAction.from == node || addEdgeAction.to == node
property bool __modifyingPosition: false
property variant __moveStartedPosition: Qt.point(0, 0)
Connections {
target: selectionRect
onChanged: {
if (selectMoveAction.checked && selectionRect.contains(x, y)) {
highlighted = true
} else {
highlighted = false
}
}
}
Connections {
target: scene
onUpdateSelection: {
if (selectionRect.contains(x, y)) {
highlighted = true
} else {
highlighted = false
}
}
onDeleteSelected: {
if (highlighted) {
deleteNode(node)
}
}
onStartMoveSelected: {
if (!highlighted) {
return
}
__moveStartedPosition.x = node.x
__moveStartedPosition.y = node.y
node.x = Qt.binding(function() { return __moveStartedPosition.x + sceneAction.lastMousePosition.x - sceneAction.lastMousePressed.x })
node.y = Qt.binding(function() { return __moveStartedPosition.y + sceneAction.lastMousePosition.y - sceneAction.lastMousePressed.y })
}
onFinishMoveSelected: {
if (!highlighted) {
return
}
node.x = __moveStartedPosition.x + sceneAction.lastMousePosition.x - sceneAction.lastMousePressed.x
node.y = __moveStartedPosition.y + sceneAction.lastMousePosition.y - sceneAction.lastMousePressed.y
__moveStartedPosition.x = 0
__moveStartedPosition.y = 0
}
onCreateEdgeUpdateFromNode: {
if (nodeItem.contains(Qt.point(sceneAction.lastMousePressed.x, sceneAction.lastMousePressed.y))) {
node.highlighted = true
addEdgeAction.from = node
}
}
onCreateEdgeUpdateToNode: {
if (nodeItem.contains(Qt.point(sceneAction.lastMouseReleased.x, sceneAction.lastMouseReleased.y))) {
node.highlighted = true
addEdgeAction.to = node
}
}
}
onXChanged: {
if (scene.origin != nodeItem.origin
|| nodeItem.__modifyingPosition
) { // do nothing if item not initialized
return;
}
if (x < 10) {
nodeItem.__modifyingPosition = true;
var delta = Math.max((10 - x), 10)
scene.origin = Qt.point(scene.origin.x - delta, scene.origin.y);
scene.width += delta;
nodeItem.__modifyingPosition = false;
return;
}
if (x + width + 10 > scene.width) {
nodeItem.__modifyingPosition = true;
var delta = Math.max(scene.width - (x + width) + 10, 10);
scene.width += delta;
nodeItem.__modifyingPosition = false;
return;
}
}
onYChanged: {
if (scene.origin != nodeItem.origin
|| nodeItem.__modifyingPosition
) { // do nothing if item not initialized
return;
}
if (y < 10) {
nodeItem.__modifyingPosition = true;
var delta = (10 - y)
scene.origin = Qt.point(scene.origin.x, scene.origin.y - delta);
scene.height += delta;
nodeItem.__modifyingPosition = false;
return;
}
if (y + height + 10 > scene.height) {
nodeItem.__modifyingPosition = true;
var delta = Math.max(scene.height - (y + height) + 10, 10);
scene.height += delta;
nodeItem.__modifyingPosition = false;
return;
}
}
NodePropertyItem {
anchors.centerIn: parent
node: model.dataRole
}
Drag.active: dragArea.drag.active
MouseArea {
id: dragArea
anchors.fill: parent
propagateComposedEvents: true
drag.target: { // only enable drag when move/select checked
selectMoveAction.checked ? parent : undefined
}
Loader {
id: nodeDialogLoader
}
onDoubleClicked: {
showNodePropertiesDialog(nodeItem.node);
mouse.accepted = true
}
onPressed: {
// never handle undefined actions signals
if (!(selectMoveAction.checked || deleteAction.checked)) {
mouse.accepted = false
return
}
if (deleteAction.checked) {
deleteNode(nodeItem.node)
mouse.accepted = true
return
}
// single-node move action: directly handle it
sceneAction.nodePressed = true
if (selectMoveAction.checked && !nodeItem.highlighted) {
scene.clearSelection()
nodeItem.highlighted = true
mouse.accepted = true
return
}
// multi-node move action: gets handled by state-machine
if (selectMoveAction.checked && nodeItem.highlighted) {
mouse.accepted = false
return
}
}
onReleased: {
sceneAction.nodePressed = false
}
}
}
}
}
}
RowLayout {
id: extraToolbarCreateNode
visible: addNodeAction.checked
anchors {
top: sceneScrollView.top
right:sceneScrollView.right
topMargin: 10
rightMargin: 5
}
ComboBox {
id: nodeTypeSelector
model: nodeTypeModel
textRole: "titleRole"
}
}
RowLayout {
id: extraToolbarCreateEdge
visible: addEdgeAction.checked
anchors {
top: sceneScrollView.top
right:sceneScrollView.right
topMargin: 10
rightMargin: 5
}
ComboBox {
id: edgeTypeSelector
model: edgeTypeModel
textRole: "titleRole"
}
}
// state machine only for select/move
DSM.StateMachine {
id: dsmSelectMove
initialState: smStateIdle
running: true
DSM.State {
id: smStateIdle
DSM.SignalTransition {
targetState: smStateMoving
signal: sceneAction.onPressed
guard: sceneAction.nodePressed
}
DSM.SignalTransition {
targetState: smStateSelecting
signal: sceneAction.onPressed
guard: !sceneAction.nodePressed
}
DSM.SignalTransition {
signal: sceneAction.onClicked
onTriggered: {
scene.clearSelection
}
}
}
DSM.State {
id: smStateSelecting
DSM.SignalTransition {
signal: sceneAction.onPositionChanged
onTriggered: {
selectionRect.visible = true
selectionRect.to = sceneAction.lastMousePosition
}
}
DSM.SignalTransition {
targetState: smStateIdle
signal: sceneAction.onReleased
}
onEntered: {
scene.clearSelection()
selectionRect.from = sceneAction.lastMousePressed
}
onExited: {
selectionRect.visible = false
}
}
DSM.State {
id: smStateMoving
DSM.SignalTransition {
targetState: smStateIdle
signal: sceneAction.onReleased
}
onEntered: {
scene.startMoveSelected();
}
onExited: {
scene.finishMoveSelected()
}
}
}
// state matchine solely for edge creation
DSM.StateMachine {
id: dsmCreateEdge
initialState: ceStateIdle
running: false
DSM.State {
id: ceStateIdle
DSM.SignalTransition {
targetState: ceStateCreateEdgeTo
signal: sceneAction.onPressed
}
onExited: {
addEdgeAction.to = null
scene.createEdgeUpdateFromNode()
}
}
DSM.State {
id: ceStateCreateEdgeTo
DSM.SignalTransition {
targetState: ceStateIdle
signal: sceneAction.onReleased
}
onEntered: {
createLineMarker.visible = true
}
onExited: {
scene.createEdgeUpdateToNode()
addEdgeAction.apply()
createLineMarker.visible = false
}
}
}
}
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