/** * The 'panzoom' interaction allows to react to gestures in D3 components and interpret * them as pan and zoom actions. * One can then listen to the 'panzoom' event of the interaction or implement the * {@link Ext.d3.Component#onPanZoom} method and receive the translation and scaling * components that can be applied to the content. * The way in which pan/zoom gestures are interpreted is highly configurable, * and it's also possible to show a scroll indicator. */Ext.define('Ext.d3.interaction.PanZoom', { extend: 'Ext.d3.interaction.Abstract', type: 'panzoom', alias: 'd3.interaction.panzoom', isPanZoom: true, config: { /** * @cfg {Object} pan The pan interaction config. Set to `null` if panning is not desired. * @cfg {String} pan.gesture The pan gesture, must have 'start' and 'end' counterparts. * @cfg {Boolean} pan.constrain If `false`, the panning will be unconstrained, * even if {@link #contentRect} and {@link #viewportRect} configs are set. * @cfg {Object} pan.momentum Momentum scrolling config. Set to `null` to pan * with no momentum. * @cfg {Number} pan.momentum.friction The magnitude of the friction force. * @cfg {Number} pan.momentum.spring Spring constant. Spring force will be proportional * to the degree of viewport bounds penetration (displacement from equilibrium position), * as well as this spring constant. * See [Hooke's law](https://en.wikipedia.org/wiki/Hooke%27s_law). */ pan: { gesture: 'drag', constrain: true, momentum: { friction: 1, spring: 0.2 } }, /** * @cfg {Object} zoom The zoom interaction config. Set to `null` if zooming is not desired. * @cfg {String} zoom.gesture The zoom gesture, must have 'start' and 'end' counterparts. * @cfg {Number[]} zoom.extent Minimum and maximum zoom levels as an array of two numbers. * @cfg {Boolean} zoom.uniform Set to `false` to allow independent scaling in both * directions. * @cfg {Object} zoom.mouseWheel Set to `null` if scaling with mouse wheel is not desired. * @cfg {Number} zoom.mouseWheel.factor How much to zoom in or out on each mouse wheel step. * @cfg {Object} zoom.doubleTap Set to `null` if zooming in on double tap is not desired. * @cfg {Number} zoom.doubleTap.factor How much to zoom in on double tap. */ zoom: { gesture: 'pinch', extent: [1, 3], uniform: true, mouseWheel: { factor: 1.02 }, doubleTap: { factor: 1.1 } }, /** * A function that returns natural (before transformations) content position and dimensions. * If {@link #viewportRect} config is specified as well, constrains the panning, * so that the content is always visible (can't pan offscreen). * By default the panning is unconstrained. * The interaction needs to know the content's bounding box at any given time, * as the content can be very dynamic, e.g. animate at a time when panning or zooming action * is performed. * @cfg {Function} [contentRect] * @return {Object} rect * @return {Number} return.x * @return {Number} return.y * @return {Number} return.width * @return {Number} return.height */ contentRect: null, /** * A function that returns viewport position and dimensions in component's coordinates. * If {@link #contentRect} config is specified as well, constrains the panning, * so that the content is always visible (can't pan offscreen). * By default the panning is unconstrained. * @cfg {Function} [viewportRect] * @return {Object} rect * @return {Number} return.x * @return {Number} return.y * @return {Number} return.width * @return {Number} return.height */ viewportRect: null, /** * @cfg {Object} indicator The scroll indicator config. Set to `null` to disable. * @cfg {String} indicator.parent The name of the reference on the component to the element * that will be used as the scroll indicator container. */ indicator: { parent: 'element' } }, /** * @private * @property {Number[]} panOrigin * Coordinates of the initial touch/click. */ panOrigin: null, /** * @private * Horizontal and vertical distances between original touches. * @property {Number[]} startSpread */ startSpread: null, /** * Minimum distance between fingers in a pinch gesture. * If the actual distance is smaller, this value will be used. * @property {Number} minSpread */ minSpread: 50, /** * @private * @property {Number[]} scaling */ scaling: null, /** * @private * @property {Number[]} oldScaling */ oldScaling: null, /** * @private * @property {Number[]} oldScalingCenter */ oldScalingCenter: null, /** * @private * @property {Number[]} translation */ translation: null, /** * @private * @property {Number[]} oldTranslation */ oldTranslation: null, /** * @private * The amount the cursor/finger moved horizontally between the last two pan events. * Can be thought of as instantaneous velocity. * @property {Number} dx */ dx: 0, /** * @private * The amount the cursor/finger moved vertically between the last two pan events. * Can be thought of as instantaneous velocity. * @property {Number} dy */ dy: 0, velocityX: 0, velocityY: 0, pan: null, viewportRect: null, contentRect: null, updatePan: function(pan) { this.pan = pan; this.resetComponent(); }, updateZoom: function() { this.resetComponent(); }, updateContentRect: function(contentRect) { this.contentRect = contentRect; this.constrainTranslation(); }, updateViewportRect: function(viewportRect) { this.viewportRect = viewportRect; this.constrainTranslation(); }, constructor: function(config) { var me = this; me.translation = config && config.translation ? config.translation.slice() : [0, 0]; me.scaling = config && config.scaling ? config.scaling.slice() : [1, 1]; me.callParent(arguments); }, destroy: function() { this.destroyIndicator(); Ext.AnimationQueue.stop(this.panFxFrame, this); this.callParent(); }, /** * @private * Converts page coordinates to {@link #viewportRect viewport} coordinates. * @param {Number} pageX * @param {Number} pageY * @return {Number[]} */ toViewportXY: function(pageX, pageY) { var elementXY = this.component.element.getXY(), viewportRect = this.viewportRect && this.viewportRect(), x = pageX - elementXY[0] - (viewportRect ? viewportRect.x : 0), y = pageY - elementXY[1] - (viewportRect ? viewportRect.y : 0); return [x, y]; }, /** * @private * Same as {@link #toViewportXY}, but accounts for RTL. */ toRtlViewportXY: function(pageX, pageY) { var xy = this.toViewportXY(pageX, pageY), component = this.component; if (component.getInherited().rtl) { xy[0] = component.getWidth() - xy[0]; } return xy; }, /** * @private * Makes sure the given `range` is within `x` range. * If `y` range is specified, `x` and `y` are used to constrain the first and second * components of the `range` array, respectively. * @param {Number[]} range * @param {Number[]} x * @param {Number[]} [y] * @return {Number[]} The given `range` object with applied constraints. */ constrainRange: function(range, x, y) { y = y || x; range[0] = Math.max(x[0], Math.min(x[1], range[0])); range[1] = Math.max(y[0], Math.min(y[1], range[1])); return range; }, constrainTranslation: function(translation) { var me = this, pan = me.pan, constrain = pan && pan.constrain, momentum = pan && pan.momentum, contentRect = constrain && me.contentRect && me.contentRect(), viewportRect = constrain && me.viewportRect && me.viewportRect(), constraints, offLimits; if (contentRect && viewportRect) { translation = translation || me.translation; constraints = me.getConstraints(contentRect, viewportRect); offLimits = me.getOffLimits(translation, constraints); me.constrainRange( translation, constraints.slice(0, 2), constraints.slice(2) ); if (offLimits && momentum && momentum.spring) { // Allow slight bounds violation. translation[0] += offLimits[0] * momentum.spring; translation[1] += offLimits[1] * momentum.spring; } me.updateIndicator(contentRect, viewportRect); } }, /** * @private * Creates an interpolator function that maps values from an input domain * to the range of [0..1]. The domain can be specified via the * `domain` method of the interpolator. The `multiplier` is applied * to the calculated value in the output range before it is returned. * @param {Number} multiplier * @return {Function} */ createInterpolator: function(multiplier) { var start = 0, delta = 1, interpolator; multiplier = multiplier || 1; interpolator = function(x) { var result = 0; if (delta) { result = (x - start) / delta; result = Math.max(0, result); result = Math.min(1, result); result *= multiplier; } return result; }; interpolator.domain = function(a, b) { start = a; delta = b - a; }; return interpolator; }, updateIndicator: function(contentRect, viewportRect) { var me = this, hScale = me.hScrollScale, vScale = me.vScrollScale, contentX, contentY, contentWidth, contentHeight, h0, h1, v0, v1, sx, sy; contentRect = contentRect || me.contentRect && me.contentRect(); viewportRect = viewportRect || me.viewportRect && me.viewportRect(); if (me.hScroll && contentRect && viewportRect) { sx = me.scaling[0]; sy = me.scaling[1]; contentX = contentRect.x * sx + me.translation[0]; contentY = contentRect.y * sy + me.translation[1]; contentWidth = contentRect.width * sx; contentHeight = contentRect.height * sy; if (contentWidth > viewportRect.width) { hScale.domain(contentX, contentX + contentWidth); h0 = hScale(0); h1 = hScale(viewportRect.width); me.hScrollBar.style.left = h0 + '%'; me.hScrollBar.style.width = (h1 - h0) + '%'; me.hScroll.dom.style.display = 'block'; } else { me.hScroll.dom.style.display = 'none'; } if (contentHeight > viewportRect.height) { vScale.domain(contentY, contentY + contentHeight); v0 = vScale(0); v1 = vScale(viewportRect.height); me.vScrollBar.style.top = v0 + '%'; me.vScrollBar.style.height = (v1 - v0) + '%'; me.vScroll.dom.style.display = 'block'; } else { me.vScroll.dom.style.display = 'none'; } } }, /** * @private * Determines the mininum and maximum translation values based on the dimensions of * content and viewport. */ getConstraints: function(contentRect, viewportRect) { var me = this, pan = me.pan, result = null, contentX, contentY, contentWidth, contentHeight, sx, sy, dx, dy; contentRect = pan && pan.constrain && (contentRect || me.contentRect && me.contentRect()); viewportRect = viewportRect || me.viewportRect && me.viewportRect(); if (contentRect && viewportRect) { sx = me.scaling[0]; sy = me.scaling[1]; contentX = contentRect.x * sx; contentY = contentRect.y * sy; contentWidth = contentRect.width * sx; contentHeight = contentRect.height * sy; dx = viewportRect.width - contentWidth - contentX; dy = viewportRect.height - contentHeight - contentY; result = [ Math.min(-contentX, dx), // minX Math.max(-contentX, dx), // maxX Math.min(-contentY, dy), // minY Math.max(-contentY, dy) // maxY ]; } return result; }, /** * @private * Returns the amounts by which translation components are bigger or smaller than * constraints. If a value is positive/negative, the translation component is bigger/smaller * than maximum/minimum allowed translation by that amount. * @param translation * @param constraints * @param minimum * @return {Number[]} */ getOffLimits: function(translation, constraints, minimum) { var me = this, result = null, minX, minY, maxX, maxY, x, y; constraints = constraints || me.getConstraints(); minimum = minimum || 0.1; if (constraints) { translation = translation || me.translation; x = translation[0]; y = translation[1]; minX = constraints[0]; maxX = constraints[1]; minY = constraints[2]; maxY = constraints[3]; if (x < minX) { x = x - minX; } else if (x > maxX) { x = x - maxX; } else { x = 0; } if (y < minY) { y = y - minY; } else if (y > maxY) { y = y - maxY; } else { y = 0; } if (x && Math.abs(x) < minimum) { x = 0; } if (y && Math.abs(y) < minimum) { y = 0; } if (x || y) { result = [x, y]; } } return result; }, translate: function(x, y) { var translation = this.translation; this.setTranslation( translation[0] + x, translation[1] + y ); }, setTranslation: function(x, y) { var me = this, translation = me.translation; translation[0] = x; translation[1] = y; me.constrainTranslation(translation); me.fireEvent('panzoom', me, me.scaling, translation); }, scale: function(sx, sy, center) { var scaling = this.scaling; this.setScaling( scaling[0] * sx, scaling[1] * sy, center ); }, setScaling: function(sx, sy, center) { var me = this, zoom = me.getZoom(), scaling = me.scaling, oldSx = scaling[0], oldSy = scaling[1], translation = me.translation, oldTranslation = me.oldTranslation, cx, cy; if (zoom) { if (zoom.uniform) { sx = sy = (sx + sy) / 2; } scaling[0] = sx; scaling[1] = sy; me.constrainRange(scaling, zoom.extent); // Actual scaling delta. sx = scaling[0] / oldSx; sy = scaling[1] / oldSy; cx = center && center[0] || 0; cy = center && center[1] || 0; /* eslint-disable max-len */ // To scale around center we need to: // // 1) preserve existing translation // 2) translate coordinate grid to the center of scaling (taking existing translation into account) // 3) scale coordinate grid // 4) translate back by the same amount, this time in scaled coordinate grid // // Step 1 Step 2 Step 3 Step 4 // |1 0 tx| |1 0 (cx - tx)| |sx 0 0| |1 0 -(cx - tx)| |sx 0 cx + sx * (tx - cx)| // |0 1 ty| * |0 1 (cy - ty)| * |0 sy 0| * |0 1 -(cy - ty)| = |0 sy cy + sy * (ty - cy)| // |0 0 1| |0 0 1 | |0 0 1| |0 0 1 | |0 0 1 | // // Multiplying matrices in reverse order (column-major), get the result. /* eslint-enable max-len */ translation[0] = cx + sx * (translation[0] - cx); translation[1] = cy + sy * (translation[1] - cy); // We won't always have oldTranslation, e.g. when scaling with mouse wheel // or calling the method directly. if (oldTranslation) { // The way panning while zooming is implemented in the 'onZoomGesture' // is the delta between original center of scaling and the current center of scaling // is added to the original translation (that we save in 'onZoomGestureStart'). // However, scaling invalidates that original translation, and it needs to be // recalculated here. oldTranslation[0] = cx - (cx - oldTranslation[0]) * sx; oldTranslation[1] = cy - (cy - oldTranslation[1]) * sy; } me.constrainTranslation(translation); me.fireEvent('panzoom', me, scaling, translation); } }, /** * Sets the pan and zoom values of the interaction without firing the `panzoom` event. * This method should be called by components that are using the interaction, but set * some initial translation/scaling themselves, to notify the interaction about the * changes they've made. * @param {Number[]} pan * @param {Number[]} zoom */ setPanZoomSilently: function(pan, zoom) { var me = this; me.suspendEvent('panzoom'); pan && me.setTranslation(pan[0], pan[1]); zoom && me.setScaling(zoom[0], zoom[1]); me.resumeEvent('panzoom'); }, /** * Sets the pan and zoom values of the interaction. * @param {Number[]} pan * @param {Number[]} zoom */ setPanZoom: function(pan, zoom) { var me = this; me.setPanZoomSilently(pan, zoom); me.fireEvent('panzoom', me, me.scaling, me.translation); }, /** * Normalizes the given vector represented by `x` and `y` components, * and optionally scales it by the `factor` (in other words, makes it * a certain length without changing the direction). * @param x * @param y * @param factor * @return {Number[]} */ normalize: function(x, y, factor) { var k = (factor || 1) / this.magnitude(x, y); return [x * k, y * k]; }, /** * Returns the magnitude of a vector specified by `x` and `y`. * @param x {Number} * @param y {Number} * @return {Number} */ magnitude: function(x, y) { return Math.sqrt(x * x + y * y); }, /** * @private * @param {Object} pan The {@link #pan} config. */ panFx: function(pan) { if (!pan.momentum) { return; } // eslint-disable-next-line vars-on-top var me = this, momentum = pan.momentum, translation = me.translation, offLimits = me.getOffLimits(translation), velocityX = me.velocityX = me.dx, velocityY = me.velocityY = me.dy, friction, spring; // If we let go at a time when the content is already off-screen (on x, y or both axes), // then we only want the spring force acting on the content to bring it back. // Just feels more natural this way. if (offLimits) { if (offLimits[0]) { me.velocityX = 0; velocityX = offLimits[0]; } if (offLimits[1]) { me.velocityY = 0; velocityY = offLimits[1]; } } // Both friction and spring forces can be derived from velocity, // by changing its magnitude and flipping direction. friction = me.normalize(velocityX, velocityY, -momentum.friction); me.frictionX = friction[0]; me.frictionY = friction[1]; spring = me.normalize(velocityX, velocityY, -momentum.spring); me.springX = spring[0]; me.springY = spring[1]; Ext.AnimationQueue.start(me.panFxFrame, me); }, /** * @private * Increments a non-zero value without crossing zero. * @param {Number} x Current value. * @param {Number} inc Increment. * @return {Number} */ incKeepSign: function(x, inc) { if (x) { // x * inc < 0 is only when x and inc have opposite signs. if (x * inc < 0 && Math.abs(x) < Math.abs(inc)) { return 0; // sign change is not allowed, return 0 } else { return x + inc; } } return x; }, panFxFrame: function() { var me = this, translation = me.translation, offLimits = me.getOffLimits(translation), offX = offLimits && offLimits[0], offY = offLimits && offLimits[1], absOffX = 0, absOffY = 0, // combined force vector forceX = 0, forceY = 0, // the value at which the force is considered too weak and no longer acting cutoff = 1, springX, springY; // Apply friction to velocity. forceX += me.velocityX = me.incKeepSign(me.velocityX, me.frictionX); forceY += me.velocityY = me.incKeepSign(me.velocityY, me.frictionY); if (offX) { absOffX = Math.abs(offX); springX = me.springX * absOffX; // forceX equals velocityX at this point. // Apply spring force to velocity. me.velocityX = me.incKeepSign(forceX, springX); // velocityX can't change sign (stops at zero), // but this doesn't affect combined force calculation, // it may very well change its direction. forceX += springX; if (Math.abs(forceX) < 0.1) { forceX = Ext.Number.sign(forceX) * 0.1; } // If only the spring force is left acting, // and it's so small, it's going to barely move the content, // or so strong, the content edge is going to overshoot the viewport boundary ... if (!(me.velocityX || Math.abs(forceX) > cutoff || me.incKeepSign(offX, forceX))) { forceX = -offX; // ... snap to boundary } } if (offY) { absOffY = Math.abs(offY); springY = me.springY * absOffY; me.velocityY = me.incKeepSign(forceY, springY); forceY += springY; if (Math.abs(forceY) < 0.1) { forceY = Ext.Number.sign(forceY) * 0.1; } if (!(me.velocityY || Math.abs(forceY) > cutoff || me.incKeepSign(offY, forceY))) { forceY = -offY; } } me.prevForceX = forceX; me.prevForceY = forceY; translation[0] += forceX; translation[1] += forceY; me.updateIndicator(); if (!(forceX || forceY)) { Ext.AnimationQueue.stop(me.panFxFrame, me); } me.fireEvent('panzoom', me, me.scaling, translation); }, getGestures: function() { var me = this, gestures = me.gestures, pan = me.getPan(), zoom = me.getZoom(), panGesture, zoomGesture; if (!gestures) { me.gestures = gestures = {}; if (pan) { panGesture = pan.gesture; gestures[panGesture] = 'onPanGesture'; gestures[panGesture + 'start'] = 'onPanGestureStart'; gestures[panGesture + 'end'] = 'onPanGestureEnd'; gestures[panGesture + 'cancel'] = 'onPanGestureEnd'; } if (zoom) { zoomGesture = zoom.gesture; gestures[zoomGesture] = 'onZoomGesture'; gestures[zoomGesture + 'start'] = 'onZoomGestureStart'; gestures[zoomGesture + 'end'] = 'onZoomGestureEnd'; gestures[zoomGesture + 'cancel'] = 'onZoomGestureEnd'; if (zoom.doubleTap) { gestures.doubletap = 'onDoubleTap'; } if (zoom.mouseWheel) { gestures.wheel = 'onMouseWheel'; } } } return gestures; }, updateGestures: function(gestures) { this.gestures = gestures; }, isPanning: function(pan) { pan = pan || this.getPan(); return pan && this.getLocks()[pan.gesture] === this; }, onPanGestureStart: function(e) { // e.touches check is for IE11/Edge. // There was a bug with e.touches where reported coordinates were incorrect, // so a switch to e.event.touches was made, but those are not available in IE11/Edge. // The bug might have been fixed since then. var me = this, touches = e && e.event && e.event.touches || e.touches, pan = me.getPan(), xy; if (pan && (!touches || touches.length < 2)) { e.claimGesture(); Ext.AnimationQueue.stop(me.panFxFrame, me); me.lockEvents(pan.gesture); xy = e.getXY(); me.panOrigin = me.lastPanXY = me.toRtlViewportXY(xy[0], xy[1]); me.oldTranslation = me.translation.slice(); return false; // stop event propagation } }, onPanGesture: function(e) { var me = this, oldTranslation = me.oldTranslation, panOrigin = me.panOrigin, xy, dx, dy; if (me.isPanning()) { xy = e.getXY(); xy = me.toRtlViewportXY(xy[0], xy[1]); me.dx = xy[0] - me.lastPanXY[0]; me.dy = xy[1] - me.lastPanXY[1]; me.lastPanXY = xy; // Displacement relative to the original touch point. dx = xy[0] - panOrigin[0]; dy = xy[1] - panOrigin[1]; me.setTranslation( oldTranslation[0] + dx, oldTranslation[1] + dy ); return false; } }, onPanGestureEnd: function() { var me = this, pan = me.getPan(); if (me.isPanning(pan)) { me.panOrigin = null; me.oldTranslation = null; me.unlockEvents(pan.gesture); me.panFx(pan); return false; } }, onZoomGestureStart: function(e) { var me = this, zoom = me.getZoom(), touches = e && e.event && e.event.touches || e.touches, point1, point2, // points in local coordinates xSpread, ySpread, // distance between points touch1, touch2; if (zoom && touches && touches.length === 2) { e.claimGesture(); me.lockEvents(zoom.gesture); me.oldTranslation = me.translation.slice(); touch1 = touches[0]; touch2 = touches[1]; point1 = me.toViewportXY(touch1.pageX, touch1.pageY); point2 = me.toViewportXY(touch2.pageX, touch2.pageY); xSpread = point2[0] - point1[0]; ySpread = point2[1] - point1[1]; me.startSpread = [ Math.max(me.minSpread, Math.abs(xSpread)), Math.max(me.minSpread, Math.abs(ySpread)) ]; me.oldScaling = me.scaling.slice(); me.oldScalingCenter = [ point1[0] + 0.5 * xSpread, point1[1] + 0.5 * ySpread ]; return false; } }, onZoomGesture: function(e) { var me = this, zoom = me.getZoom(), startSpread = me.startSpread, oldScaling = me.oldScaling, oldScalingCenter = me.oldScalingCenter, touches = e && e.event && e.event.touches || e.touches, point1, point2, // points in local coordinates xSpread, ySpread, // distance between points xScale, yScale, // current scaling factors touch1, touch2, scalingCenter, dx, dy; if (zoom && me.getLocks()[zoom.gesture] === me) { touch1 = touches[0]; touch2 = touches[1]; point1 = me.toViewportXY(touch1.pageX, touch1.pageY); point2 = me.toViewportXY(touch2.pageX, touch2.pageY); xSpread = point2[0] - point1[0]; ySpread = point2[1] - point1[1]; scalingCenter = [ point1[0] + 0.5 * xSpread, point1[1] + 0.5 * ySpread ]; // Displacement relative to the original zoom center. dx = scalingCenter[0] - oldScalingCenter[0]; dy = scalingCenter[1] - oldScalingCenter[1]; // For zooming to feel natural, the panning should work as well. me.setTranslation( me.oldTranslation[0] + dx, me.oldTranslation[1] + dy ); xSpread = Math.max(me.minSpread, Math.abs(xSpread)); ySpread = Math.max(me.minSpread, Math.abs(ySpread)); xScale = xSpread / startSpread[0]; yScale = ySpread / startSpread[1]; me.setScaling( xScale * oldScaling[0], yScale * oldScaling[1], scalingCenter ); return false; } }, onZoomGestureEnd: function() { var me = this, zoom = me.getZoom(); if (zoom && me.getLocks()[zoom.gesture] === me) { me.startSpread = null; me.oldScalingCenter = null; me.oldTranslation = null; me.unlockEvents(zoom.gesture); // Since panning while zooming is possible, // we have to make sure to return within bounds. me.dx = 0; // Though, clear velocity to avoid any weird motion, me.dy = 0; // after all we aren't really panning... me.panFx(me.getPan()); return false; } }, onMouseWheel: function(e) { var me = this, delta = e.getWheelDelta(), // Normalized y-delta. zoom = me.getZoom(), factor, center, xy; if (zoom && zoom.mouseWheel && (factor = zoom.mouseWheel.factor)) { factor = Math.pow(factor, delta); xy = e.getXY(); center = me.toViewportXY(xy[0], xy[1]); me.scale(factor, factor, center); e.preventDefault(); } }, onDoubleTap: function(e) { var me = this, zoom = me.getZoom(), factor, center, xy; if (zoom && zoom.doubleTap && (factor = zoom.doubleTap.factor)) { xy = e.getXY(); center = me.toViewportXY(xy[0], xy[1]); me.scale(factor, factor, center); } }, createIndicator: function() { var me = this; if (me.hScroll) { return; } me.hScroll = Ext.dom.Element.create({ tag: 'div', classList: [ Ext.baseCSSPrefix + 'd3-scroll', Ext.baseCSSPrefix + 'd3-hscroll' ], style: { }, children: [ { tag: 'div', reference: 'bar', classList: [ Ext.baseCSSPrefix + 'd3-scrollbar', Ext.baseCSSPrefix + 'd3-hscrollbar' ] } ] }); me.hScrollBar = me.hScroll.dom.querySelector('[reference=bar]'); me.hScrollBar.removeAttribute('reference'); me.vScroll = Ext.dom.Element.create({ tag: 'div', classList: [ Ext.baseCSSPrefix + 'd3-scroll', Ext.baseCSSPrefix + 'd3-vscroll' ], style: { }, children: [ { tag: 'div', reference: 'bar', classList: [ Ext.baseCSSPrefix + 'd3-scrollbar', Ext.baseCSSPrefix + 'd3-vscrollbar' ] } ] }); me.vScrollBar = me.vScroll.dom.querySelector('[reference=bar]'); me.vScrollBar.removeAttribute('reference'); me.hScrollScale = me.createInterpolator(100); me.vScrollScale = me.createInterpolator(100); }, destroyIndicator: function() { var me = this; Ext.destroy(me.hScroll, me.vScroll); me.hScroll = me.vScroll = me.hScrollBar = me.vScrollBar = null; }, addIndicator: function(component) { var me = this, indicator = me.getIndicator(), indicatorParent = me.indicatorParent; if (indicator && !indicatorParent) { me.createIndicator(); indicatorParent = me.indicatorParent = component[indicator.parent]; if (indicatorParent) { indicatorParent.appendChild(me.hScroll); indicatorParent.appendChild(me.vScroll); } } }, removeIndicator: function() { var me = this, indicatorParent = me.indicatorParent; if (indicatorParent) { if (me.hScroll) { indicatorParent.removeChild(me.hScroll); } if (me.vScroll) { indicatorParent.removeChild(me.vScroll); } me.indicatorParent = null; } }, addComponent: function(component) { this.callParent([component]); this.addIndicator(component); }, removeComponent: function(component) { this.removeIndicator(); this.callParent([component]); } });