Scrollbars (#602)

src/components/paint-editor/paint-editor.css

@@ -90,10 +90,6 @@ $border-radius: 0.25rem;
     overflow: visible;
 }
 
-.with-eye-dropper {
-    cursor: none;
-}
-
 .mode-selector {
     display: flex;
     margin-right: calc(2 * $grid-unit);

src/components/paint-editor/paint-editor.jsx

@@ -5,6 +5,7 @@ import React from 'react';
 import PropTypes from 'prop-types';
 
 import PaperCanvas from '../../containers/paper-canvas.jsx';
+import ScrollableCanvas from '../../containers/scrollable-canvas.jsx';
 
 import BitBrushMode from '../../containers/bit-brush-mode.jsx';
 import BitLineMode from '../../containers/bit-line-mode.jsx';
@@ -200,11 +201,10 @@ const PaintEditorComponent = props => (
 
             <div>
                 {/* Canvas */}
-                <div
-                    className={classNames(
-                        styles.canvasContainer,
-                        {[styles.withEyeDropper]: props.isEyeDropping}
-                    )}
+                <ScrollableCanvas
+                    canvas={props.canvas}
+                    hideCursor={props.isEyeDropping}
+                    style={styles.canvasContainer}
                 >
                     <PaperCanvas
                         canvasRef={props.setCanvas}
@@ -231,7 +231,7 @@ const PaintEditorComponent = props => (
                             </Box>
                         ) : null
                     }
-                </div>
+                </ScrollableCanvas>
                 <div className={styles.canvasControls}>
                     {isVector(props.format) ?
                         <Button

src/components/scrollable-canvas/scrollable-canvas.css

@@ -0,0 +1,36 @@
+$scrollbar-size: 6px;
+$scrollbar-padding: 1px;
+
+.vertical-scrollbar, .horizontal-scrollbar {
+    position: absolute;
+    background: #BEBEBECD;
+    border-radius: 3px;
+    cursor: pointer;
+}
+.vertical-scrollbar-wrapper {
+    position: absolute;
+    width: $scrollbar-size;
+    right: $scrollbar-padding;
+    top: $scrollbar-padding;
+    height: calc(100% - $scrollbar-size - $scrollbar-padding);
+}
+
+.horizontal-scrollbar-wrapper {
+    position: absolute;
+    height: $scrollbar-size;
+    left: $scrollbar-padding;
+    bottom: $scrollbar-padding;
+    width: calc(100% - $scrollbar-size - $scrollbar-padding);
+}
+
+.vertical-scrollbar {
+    width: $scrollbar-size;
+}
+
+.horizontal-scrollbar {
+    height: $scrollbar-size;
+}
+
+.hide-cursor {
+    cursor: none;
+}

src/components/scrollable-canvas/scrollable-canvas.jsx

@@ -0,0 +1,54 @@
+import classNames from 'classnames';
+import React from 'react';
+import PropTypes from 'prop-types';
+
+import styles from './scrollable-canvas.css';
+
+const ScrollableCanvasComponent = props => (
+    <div
+        className={classNames(
+            props.style,
+            {[styles.hideCursor]: props.hideCursor}
+        )}
+    >
+        {props.children}
+        <div className={styles.horizontalScrollbarWrapper}>
+            <div
+                className={styles.horizontalScrollbar}
+                style={{
+                    width: `${props.horizontalScrollLengthPercent}%`,
+                    left: `${props.horizontalScrollStartPercent}%`,
+                    visibility: `${props.hideCursor ||
+                        Math.abs(props.horizontalScrollLengthPercent - 100) < 1e-8 ? 'hidden' : 'visible'}`
+                }}
+                onMouseDown={props.onHorizontalScrollbarMouseDown}
+            />
+        </div>
+        <div className={styles.verticalScrollbarWrapper}>
+            <div
+                className={styles.verticalScrollbar}
+                style={{
+                    height: `${props.verticalScrollLengthPercent}%`,
+                    top: `${props.verticalScrollStartPercent}%`,
+                    visibility: `${props.hideCursor ||
+                        Math.abs(props.verticalScrollLengthPercent - 100) < 1e-8 ? 'hidden' : 'visible'}`
+                }}
+                onMouseDown={props.onVerticalScrollbarMouseDown}
+            />
+        </div>
+    </div>
+);
+
+ScrollableCanvasComponent.propTypes = {
+    children: PropTypes.node.isRequired,
+    hideCursor: PropTypes.bool,
+    horizontalScrollLengthPercent: PropTypes.number,
+    horizontalScrollStartPercent: PropTypes.number,
+    onHorizontalScrollbarMouseDown: PropTypes.func.isRequired,
+    onVerticalScrollbarMouseDown: PropTypes.func.isRequired,
+    style: PropTypes.string,
+    verticalScrollLengthPercent: PropTypes.number,
+    verticalScrollStartPercent: PropTypes.number
+};
+
+export default ScrollableCanvasComponent;

src/containers/paint-editor.jsx

@@ -100,8 +100,11 @@ class PaintEditor extends React.Component {
             this.startEyeDroppingLoop();
         } else if (!this.props.isEyeDropping && prevProps.isEyeDropping) {
             this.stopEyeDroppingLoop();
+        } else if (this.props.isEyeDropping && this.props.viewBounds !== prevProps.viewBounds) {
+            this.props.previousTool.activate();
+            this.props.onDeactivateEyeDropper();
+            this.stopEyeDroppingLoop();
         }
-
         if (this.props.format === Formats.VECTOR && isBitmap(prevProps.format)) {
             this.isSwitchingFormats = false;
             convertToVector(this.props.clearSelectedItems, this.handleUpdateImage);
@@ -329,7 +332,6 @@ class PaintEditor extends React.Component {
             this.props.previousTool.activate();
             this.props.onDeactivateEyeDropper();
             this.stopEyeDroppingLoop();
-            this.setState({colorInfo: null});
         }
     }
     startEyeDroppingLoop () {
@@ -367,6 +369,7 @@ class PaintEditor extends React.Component {
     }
     stopEyeDroppingLoop () {
         clearInterval(this.intervalId);
+        this.setState({colorInfo: null});
     }
     render () {
         return (
@@ -442,7 +445,8 @@ PaintEditor.propTypes = {
         stack: PropTypes.arrayOf(PropTypes.object).isRequired,
         pointer: PropTypes.number.isRequired
     }),
-    updateViewBounds: PropTypes.func.isRequired
+    updateViewBounds: PropTypes.func.isRequired,
+    viewBounds: PropTypes.instanceOf(paper.Matrix).isRequired
 };
 
 const mapStateToProps = state => ({
@@ -455,7 +459,8 @@ const mapStateToProps = state => ({
     previousTool: state.scratchPaint.color.eyeDropper.previousTool,
     selectedItems: state.scratchPaint.selectedItems,
     textEditing: state.scratchPaint.textEditTarget !== null,
-    undoState: state.scratchPaint.undo
+    undoState: state.scratchPaint.undo,
+    viewBounds: state.scratchPaint.viewBounds
 });
 const mapDispatchToProps = dispatch => ({
     onKeyPress: event => {

src/containers/paper-canvas.css

@@ -1,7 +1,7 @@
 .paper-canvas {
     width: 480px;
     height: 360px;
-    margin: auto;  
+    margin: auto;
     position: absolute;
     background-color: #fff;
 }

src/containers/paper-canvas.jsx

@@ -14,13 +14,12 @@ import {isGroup, ungroupItems} from '../helper/group';
 import {clearRaster, getRaster, setupLayers} from '../helper/layer';
 import {deleteSelection, getSelectedLeafItems} from '../helper/selection';
 import {clearSelectedItems, setSelectedItems} from '../reducers/selected-items';
-import {ART_BOARD_WIDTH, ART_BOARD_HEIGHT, pan, resetZoom, zoomOnFixedPoint} from '../helper/view';
+import {ART_BOARD_WIDTH, ART_BOARD_HEIGHT, resetZoom} from '../helper/view';
 import {ensureClockwise, scaleWithStrokes} from '../helper/math';
 import {clearHoveredItem} from '../reducers/hover';
 import {clearPasteOffset} from '../reducers/clipboard';
-import {updateViewBounds} from '../reducers/view-bounds';
 import {changeFormat} from '../reducers/format';
-
+import {updateViewBounds} from '../reducers/view-bounds';
 import styles from './paper-canvas.css';
 
 class PaperCanvas extends React.Component {
@@ -30,7 +29,6 @@ class PaperCanvas extends React.Component {
             'setCanvas',
             'importSvg',
             'handleKeyDown',
-            'handleWheel',
             'switchCostume'
         ]);
     }
@@ -214,38 +212,6 @@ class PaperCanvas extends React.Component {
             this.props.canvasRef(canvas);
         }
     }
-    handleWheel (event) {
-        // Multiplier variable, so that non-pixel-deltaModes are supported. Needed for Firefox.
-        // See #529 (or LLK/scratch-blocks#1190).
-        const multiplier = event.deltaMode === 0x1 ? 15 : 1;
-        const deltaX = event.deltaX * multiplier;
-        const deltaY = event.deltaY * multiplier;
-        if (event.metaKey || event.ctrlKey) {
-            // Zoom keeping mouse location fixed
-            const canvasRect = this.canvas.getBoundingClientRect();
-            const offsetX = event.clientX - canvasRect.left;
-            const offsetY = event.clientY - canvasRect.top;
-            const fixedPoint = paper.project.view.viewToProject(
-                new paper.Point(offsetX, offsetY)
-            );
-            zoomOnFixedPoint(-deltaY / 100, fixedPoint);
-            this.props.updateViewBounds(paper.view.matrix);
-            this.props.setSelectedItems(this.props.format);
-        } else if (event.shiftKey && event.deltaX === 0) {
-            // Scroll horizontally (based on vertical scroll delta)
-            // This is needed as for some browser/system combinations which do not set deltaX.
-            // See #156.
-            const dx = deltaY / paper.project.view.zoom;
-            pan(dx, 0);
-            this.props.updateViewBounds(paper.view.matrix);
-        } else {
-            const dx = deltaX / paper.project.view.zoom;
-            const dy = deltaY / paper.project.view.zoom;
-            pan(dx, dy);
-            this.props.updateViewBounds(paper.view.matrix);
-        }
-        event.preventDefault();
-    }
     render () {
         return (
             <canvas
@@ -253,7 +219,6 @@ class PaperCanvas extends React.Component {
                 height="360px"
                 ref={this.setCanvas}
                 width="480px"
-                onWheel={this.handleWheel}
             />
         );
     }

src/containers/scrollable-canvas.jsx

@@ -0,0 +1,174 @@
+import paper from '@scratch/paper';
+import PropTypes from 'prop-types';
+
+import React from 'react';
+import {connect} from 'react-redux';
+import ScrollableCanvasComponent from '../components/scrollable-canvas/scrollable-canvas.jsx';
+
+import {ART_BOARD_WIDTH, ART_BOARD_HEIGHT, clampViewBounds, pan, zoomOnFixedPoint} from '../helper/view';
+import {updateViewBounds} from '../reducers/view-bounds';
+import {redrawSelectionBox} from '../reducers/selected-items';
+
+import {getEventXY} from '../lib/touch-utils';
+import bindAll from 'lodash.bindall';
+
+class ScrollableCanvas extends React.Component {
+    static get ZOOM_INCREMENT () {
+        return 0.5;
+    }
+    constructor (props) {
+        super(props);
+        bindAll(this, [
+            'handleHorizontalScrollbarMouseDown',
+            'handleHorizontalScrollbarMouseMove',
+            'handleHorizontalScrollbarMouseUp',
+            'handleVerticalScrollbarMouseDown',
+            'handleVerticalScrollbarMouseMove',
+            'handleVerticalScrollbarMouseUp',
+            'handleWheel'
+        ]);
+    }
+    componentDidMount () {
+        if (this.props.canvas) {
+            this.props.canvas.addEventListener('wheel', this.handleWheel);
+        }
+    }
+    componentWillReceiveProps (nextProps) {
+        if (nextProps.canvas) {
+            if (this.props.canvas) {
+                this.props.canvas.removeEventListener('wheel', this.handleWheel);
+            }
+            nextProps.canvas.addEventListener('wheel', this.handleWheel);
+        }
+    }
+    handleHorizontalScrollbarMouseDown (event) {
+        this.initialMouseX = getEventXY(event).x;
+        this.initialScreenX = paper.view.matrix.tx;
+        window.addEventListener('mousemove', this.handleHorizontalScrollbarMouseMove);
+        window.addEventListener('mouseup', this.handleHorizontalScrollbarMouseUp);
+        event.preventDefault();
+    }
+    handleHorizontalScrollbarMouseMove (event) {
+        const dx = this.initialMouseX - getEventXY(event).x;
+        paper.view.matrix.tx = this.initialScreenX + (dx * paper.view.zoom * 2);
+        clampViewBounds();
+        this.props.updateViewBounds(paper.view.matrix);
+        event.preventDefault();
+    }
+    handleHorizontalScrollbarMouseUp () {
+        window.removeEventListener('mousemove', this.handleHorizontalScrollbarMouseMove);
+        window.removeEventListener('mouseup', this.handleHorizontalScrollbarMouseUp);
+        this.initialMouseX = null;
+        this.initialScreenX = null;
+        event.preventDefault();
+    }
+    handleVerticalScrollbarMouseDown (event) {
+        this.initialMouseY = getEventXY(event).y;
+        this.initialScreenY = paper.view.matrix.ty;
+        window.addEventListener('mousemove', this.handleVerticalScrollbarMouseMove);
+        window.addEventListener('mouseup', this.handleVerticalScrollbarMouseUp);
+        event.preventDefault();
+    }
+    handleVerticalScrollbarMouseMove (event) {
+        const dy = this.initialMouseY - getEventXY(event).y;
+        paper.view.matrix.ty = this.initialScreenY + (dy * paper.view.zoom * 2);
+        clampViewBounds();
+        this.props.updateViewBounds(paper.view.matrix);
+        event.preventDefault();
+    }
+    handleVerticalScrollbarMouseUp (event) {
+        window.removeEventListener('mousemove', this.handleVerticalScrollbarMouseMove);
+        window.removeEventListener('mouseup', this.handleVerticalScrollbarMouseUp);
+        this.initialMouseY = null;
+        this.initialScreenY = null;
+        event.preventDefault();
+    }
+    handleWheel (event) {
+        // Multiplier variable, so that non-pixel-deltaModes are supported. Needed for Firefox.
+        // See #529 (or LLK/scratch-blocks#1190).
+        const multiplier = event.deltaMode === 0x1 ? 15 : 1;
+        const deltaX = event.deltaX * multiplier;
+        const deltaY = event.deltaY * multiplier;
+        if (event.metaKey || event.ctrlKey) {
+            // Zoom keeping mouse location fixed
+            const canvasRect = this.props.canvas.getBoundingClientRect();
+            const offsetX = event.clientX - canvasRect.left;
+            const offsetY = event.clientY - canvasRect.top;
+            const fixedPoint = paper.view.viewToProject(
+                new paper.Point(offsetX, offsetY)
+            );
+            zoomOnFixedPoint(-deltaY / 1000, fixedPoint);
+            this.props.updateViewBounds(paper.view.matrix);
+            this.props.redrawSelectionBox(); // Selection handles need to be resized after zoom
+        } else if (event.shiftKey && event.deltaX === 0) {
+            // Scroll horizontally (based on vertical scroll delta)
+            // This is needed as for some browser/system combinations which do not set deltaX.
+            // See #156.
+            const dx = deltaY / paper.view.zoom;
+            pan(dx, 0);
+            this.props.updateViewBounds(paper.view.matrix);
+        } else {
+            const dx = deltaX / paper.view.zoom;
+            const dy = deltaY / paper.view.zoom;
+            pan(dx, dy);
+            this.props.updateViewBounds(paper.view.matrix);
+        }
+        event.preventDefault();
+    }
+    render () {
+        let widthPercent = 0;
+        let heightPercent = 0;
+        let topPercent = 0;
+        let leftPercent = 0;
+        if (paper.project) {
+            const {x, y, width, height} = paper.view.bounds;
+            widthPercent = Math.min(100, 100 * width / ART_BOARD_WIDTH);
+            heightPercent = Math.min(100, 100 * height / ART_BOARD_HEIGHT);
+            const centerX = (x + (width / 2)) / ART_BOARD_WIDTH;
+            const centerY = (y + (height / 2)) / ART_BOARD_HEIGHT;
+            topPercent = Math.max(0, (100 * centerY) - (heightPercent / 2));
+            leftPercent = Math.max(0, (100 * centerX) - (widthPercent / 2));
+        }
+        return (
+            <ScrollableCanvasComponent
+                hideCursor={this.props.hideCursor}
+                horizontalScrollLengthPercent={widthPercent}
+                horizontalScrollStartPercent={leftPercent}
+                style={this.props.style}
+                verticalScrollLengthPercent={heightPercent}
+                verticalScrollStartPercent={topPercent}
+                onHorizontalScrollbarMouseDown={this.handleHorizontalScrollbarMouseDown}
+                onVerticalScrollbarMouseDown={this.handleVerticalScrollbarMouseDown}
+            >
+                {this.props.children}
+            </ScrollableCanvasComponent>
+        );
+    }
+}
+
+ScrollableCanvas.propTypes = {
+    canvas: PropTypes.instanceOf(Element),
+    children: PropTypes.node.isRequired,
+    hideCursor: PropTypes.bool,
+    redrawSelectionBox: PropTypes.func.isRequired,
+    style: PropTypes.string,
+    updateViewBounds: PropTypes.func.isRequired
+};
+
+const mapStateToProps = state => ({
+    viewBounds: state.scratchPaint.viewBounds
+});
+const mapDispatchToProps = dispatch => ({
+    redrawSelectionBox: () => {
+        dispatch(redrawSelectionBox());
+    },
+    updateViewBounds: matrix => {
+        dispatch(updateViewBounds(matrix));
+    }
+});
+
+
+export default connect(
+    mapStateToProps,
+    mapDispatchToProps
+)(ScrollableCanvas);

src/helper/view.js

@@ -9,7 +9,7 @@ const SVG_ART_BOARD_HEIGHT = 360;
 const ART_BOARD_WIDTH = 480 * 2;
 const ART_BOARD_HEIGHT = 360 * 2;
 
-const _clampViewBounds = () => {
+const clampViewBounds = () => {
     const {left, right, top, bottom} = paper.project.view.bounds;
     if (left < 0) {
         paper.project.view.scrollBy(new paper.Point(-left, 0));
@@ -37,7 +37,7 @@ const zoomOnFixedPoint = (deltaZoom, fixedPoint) => {
         .subtract(preZoomCenter);
     view.zoom = newZoom;
     view.translate(postZoomOffset.multiply(-1));
-    _clampViewBounds();
+    clampViewBounds();
 };
 
 // Zoom keeping the selection center (if any) fixed.
@@ -62,12 +62,12 @@ const zoomOnSelection = deltaZoom => {
 
 const resetZoom = () => {
     paper.project.view.zoom = .5;
-    _clampViewBounds();
+    clampViewBounds();
 };
 
 const pan = (dx, dy) => {
     paper.project.view.scrollBy(new paper.Point(dx, dy));
-    _clampViewBounds();
+    clampViewBounds();
 };
 
 export {
@@ -75,6 +75,7 @@ export {
     ART_BOARD_WIDTH,
     SVG_ART_BOARD_WIDTH,
     SVG_ART_BOARD_HEIGHT,
+    clampViewBounds,
     pan,
     resetZoom,
     zoomOnSelection,

src/reducers/selected-items.js

@@ -1,10 +1,14 @@
 import log from '../log/log';
 const CHANGE_SELECTED_ITEMS = 'scratch-paint/select/CHANGE_SELECTED_ITEMS';
+const REDRAW_SELECTION_BOX = 'scratch-paint/select/REDRAW_SELECTION_BOX';
 const initialState = [];
 
 const reducer = function (state, action) {
     if (typeof state === 'undefined') state = initialState;
     switch (action.type) {
+    case REDRAW_SELECTION_BOX:
+        if (state.length > 0) return state.slice(0); // Sends an update even though the items haven't changed
+        return state;
     case CHANGE_SELECTED_ITEMS:
         if (!action.selectedItems || !(action.selectedItems instanceof Array)) {
             log.warn(`No selected items or wrong format provided: ${action.selectedItems}`);
@@ -44,9 +48,15 @@ const clearSelectedItems = function () {
         selectedItems: []
     };
 };
+const redrawSelectionBox = function () {
+    return {
+        type: REDRAW_SELECTION_BOX
+    };
+};
 
 export {
     reducer as default,
+    redrawSelectionBox,
     setSelectedItems,
     clearSelectedItems,
     CHANGE_SELECTED_ITEMS