webglimpse
Version:
Webglimpse is a data visualization library for the web.
240 lines • 43.7 kB
JavaScript
/*
* Copyright (c) 2014, Metron, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
import { Pane, yFrac, isLeftMouseDown } from './core';
import { gray } from './color';
import { newBackgroundPainter, xyFrac_VERTSHADER, solid_FRAGSHADER, putQuadXys } from './misc';
import { Program, UniformColor, Attribute } from './shader';
import { newDynamicBuffer } from './buffer';
import { GL, hasval } from './util/util';
export function newVerticalScrollLayout() {
const layout = {
updatePrefSize: function (parentPrefSize, children) {
if (children.length === 1) {
const childPrefSize = children[0].prefSize;
// XXX: Need some way to override the child's pref-height
if (!hasval(childPrefSize.h)) {
throw new Error('Vertical-scroll layout requires child to have a defined pref-height, but its pref-height is ' + childPrefSize.h);
}
parentPrefSize.w = childPrefSize.w;
parentPrefSize.h = childPrefSize.h;
}
else if (children.length > 1) {
throw new Error('Vertical-scroll layout only works with 1 child, but pane has ' + this.children.length + ' children');
}
},
jOffset: 0,
hContent: 0,
hVisible: 0,
updateChildViewports: function (children, parentViewport) {
if (children.length === 1) {
const child = children[0];
let j;
const h = child.prefSize.h;
if (h <= parentViewport.h) {
j = parentViewport.jEnd - h;
}
else {
j = Math.min(parentViewport.j, parentViewport.jEnd - h + Math.max(0, Math.round(layout.jOffset)));
}
child.viewport.setRect(parentViewport.i, j, parentViewport.w, h);
layout.jOffset = (j + h) - parentViewport.jEnd;
layout.hContent = h;
layout.hVisible = parentViewport.h;
}
else if (children.length > 1) {
throw new Error('Vertical-scroll layout only works with 1 child, but pane has ' + this.children.length + ' children');
}
}
};
return layout;
}
export function newVerticalScrollbar(scrollLayout, drawable, options) {
const bgColor = (hasval(options) && hasval(options.bgColor) ? options.bgColor : gray(0.9));
const scrollbar = new Pane(null);
scrollbar.addPainter(newBackgroundPainter(bgColor));
scrollbar.addPainter(newVerticalScrollbarPainter(scrollLayout, options));
attachVerticalScrollMouseListeners(scrollbar, scrollLayout, drawable);
return scrollbar;
}
export function newVerticalScrollbarPainter(scrollLayout, options) {
const fgColor = (hasval(options) && hasval(options.fgColor) ? options.fgColor : gray(0.56));
const borderColor = (hasval(options) && hasval(options.borderColor) ? options.borderColor : gray(0.42));
const borderThickness = (hasval(options) && hasval(options.borderThickness) ? options.borderThickness : 1);
const borderTop = (hasval(options) && hasval(options.borderTop) ? options.borderTop : true);
const borderLeft = (hasval(options) && hasval(options.borderLeft) ? options.borderLeft : false);
const borderRight = (hasval(options) && hasval(options.borderRight) ? options.borderRight : false);
const borderBottom = (hasval(options) && hasval(options.borderBottom) ? options.borderBottom : true);
const program = new Program(xyFrac_VERTSHADER, solid_FRAGSHADER);
const u_Color = new UniformColor(program, 'u_Color');
const a_XyFrac = new Attribute(program, 'a_XyFrac');
const numFillVertices = 6;
const numBorderVertices = (borderTop ? 6 : 0) + (borderLeft ? 6 : 0) + (borderRight ? 6 : 0) + (borderBottom ? 6 : 0);
const xyFrac = new Float32Array(2 * Math.max(numFillVertices, numBorderVertices));
const xyFracBuffer = newDynamicBuffer();
return function (gl, viewport) {
const hFrac = scrollLayout.hVisible / scrollLayout.hContent;
if (hFrac < 1) {
const yTop = Math.round(((scrollLayout.hContent - (scrollLayout.jOffset)) / scrollLayout.hContent) * viewport.h + 1e-4);
const yBottom = Math.round(((scrollLayout.hContent - (scrollLayout.jOffset + scrollLayout.hVisible)) / scrollLayout.hContent) * viewport.h + 1e-4);
const yFracTop = yTop / viewport.h;
const yFracBottom = yBottom / viewport.h;
const wBorderFrac = borderThickness / viewport.w;
const hBorderFrac = borderThickness / viewport.h;
gl.disable(GL.BLEND);
program.use(gl);
// Fill
//
putQuadXys(xyFrac, 0, 0 + (borderLeft ? wBorderFrac : 0), 1 - (borderRight ? wBorderFrac : 0), yFracTop - (borderTop ? hBorderFrac : 0), yFracBottom + (borderBottom ? hBorderFrac : 0));
xyFracBuffer.setData(xyFrac.subarray(0, 2 * numFillVertices));
a_XyFrac.setDataAndEnable(gl, xyFracBuffer, 2, GL.FLOAT);
u_Color.setData(gl, fgColor);
gl.drawArrays(GL.TRIANGLES, 0, numFillVertices);
// Border
//
let index = 0;
if (borderTop) {
index = putQuadXys(xyFrac, index, 0, 1 - (borderRight ? wBorderFrac : 0), yFracTop, yFracTop - hBorderFrac);
}
if (borderBottom) {
index = putQuadXys(xyFrac, index, 0 + (borderLeft ? wBorderFrac : 0), 1, yFracBottom + hBorderFrac, yFracBottom);
}
if (borderRight) {
index = putQuadXys(xyFrac, index, 1 - wBorderFrac, 1, yFracTop, yFracBottom + (borderBottom ? hBorderFrac : 0));
}
if (borderLeft) {
index = putQuadXys(xyFrac, index, 0, 0 + wBorderFrac, yFracTop - (borderTop ? hBorderFrac : 0), yFracBottom);
}
xyFracBuffer.setData(xyFrac.subarray(0, 2 * numBorderVertices));
a_XyFrac.setDataAndEnable(gl, xyFracBuffer, 2, GL.FLOAT);
u_Color.setData(gl, borderColor);
gl.drawArrays(GL.TRIANGLES, 0, numBorderVertices);
a_XyFrac.disable(gl);
program.endUse(gl);
}
};
}
// mouse listener for scrolling while panning on the timeline itself
export function attachTimelineVerticalScrollMouseListeners(pane, scrollLayout, drawable) {
// Used when dragging inside pane
let grab = null;
let jOffset = null;
pane.mouseDown.on(function (ev) {
if (isLeftMouseDown(ev.mouseEvent)) {
grab = ev.j;
jOffset = scrollLayout.jOffset;
}
});
pane.mouseMove.on(function (ev) {
if (hasval(grab)) {
scrollLayout.jOffset = jOffset - (grab - ev.j);
drawable.redraw();
}
});
pane.mouseUp.on(function (ev) {
grab = null;
});
}
// mouse listener for scrolling while interacting with the scrollbar
export function attachVerticalScrollMouseListeners(scrollbar, scrollLayout, drawable) {
// Used when dragging the handle
let grab = null;
// Used when scrollbar is pressed-and-held outside the handle
let pageScrollTimer = null;
let recentPointerFrac = null;
scrollbar.mouseDown.on(function (ev) {
if (isLeftMouseDown(ev.mouseEvent) && !hasval(grab)) {
const topFrac = (scrollLayout.hContent - scrollLayout.jOffset) / scrollLayout.hContent;
const fracExtent = scrollLayout.hVisible / scrollLayout.hContent;
const pointerFrac = yFrac(ev);
if (topFrac - fracExtent <= pointerFrac && pointerFrac <= topFrac) {
grab = (topFrac - pointerFrac) / fracExtent;
}
else {
// If the mouse is pressed on the scrollbar but outside the handle:
//
// 1. Immediately scroll one page toward the mouse
// 2. Wait 500ms
// 3. If the mouse-button is still down, scroll one page toward the mouse
// 4. Wait 50ms
// 5. Go to Step 3
//
// (A "page" is 7/8 of the viewport extent.)
//
let direction = 0;
if (pointerFrac < topFrac - fracExtent) {
direction = +1;
}
else if (pointerFrac > topFrac) {
direction = -1;
}
scrollLayout.jOffset += direction * Math.max(1, 0.875 * scrollLayout.hVisible);
drawable.redraw();
recentPointerFrac = pointerFrac;
const pageScroll = function () {
const pageTopFrac = (scrollLayout.hContent - scrollLayout.jOffset) / scrollLayout.hContent;
const pageFracExtent = scrollLayout.hVisible / scrollLayout.hContent;
const pagePointerFrac = recentPointerFrac;
let pageDirection = 0;
if (pagePointerFrac < pageTopFrac - pageFracExtent) {
pageDirection = +1;
}
else if (pagePointerFrac > pageTopFrac) {
pageDirection = -1;
}
scrollLayout.jOffset += pageDirection * Math.max(1, 0.875 * scrollLayout.hVisible);
drawable.redraw();
pageScrollTimer = setTimeout(pageScroll, 50);
};
pageScrollTimer = setTimeout(pageScroll, 500);
}
}
});
scrollbar.mouseMove.on(function (ev) {
const pointerFrac = yFrac(ev);
if (hasval(grab)) {
const fracExtent = scrollLayout.hVisible / scrollLayout.hContent;
const topFrac = pointerFrac + grab * fracExtent;
scrollLayout.jOffset = scrollLayout.hContent - topFrac * scrollLayout.hContent;
drawable.redraw();
}
if (hasval(pageScrollTimer)) {
recentPointerFrac = pointerFrac;
}
});
scrollbar.mouseUp.on(function (ev) {
grab = null;
if (hasval(pageScrollTimer)) {
clearTimeout(pageScrollTimer);
pageScrollTimer = null;
recentPointerFrac = null;
}
});
}
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* Copyright (c) 2014, Metron, Inc.\r\n * All rights reserved.\r\n *\r\n * Redistribution and use in source and binary forms, with or without modification,\r\n * are permitted provided that the following conditions are met:\r\n *\r\n * 1. Redistributions of source code must retain the above copyright notice, this\r\n *    list of conditions and the following disclaimer.\r\n *\r\n * 2. Redistributions in binary form must reproduce the above copyright notice,\r\n *    this list of conditions and the following disclaimer in the documentation\r\n *    and/or other materials provided with the distribution.\r\n *\r\n * 3. Neither the name of the copyright holder nor the names of its contributors\r\n *    may be used to endorse or promote products derived from this software without\r\n *    specific prior written permission.\r\n *\r\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\" AND\r\n * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\r\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r\n * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR\r\n * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES\r\n * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;\r\n * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON\r\n * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\r\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\r\n * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\r\n */\r\nimport {Layout, LayoutEntry, Drawable, Pane, Painter, PointerEvent, yFrac, isLeftMouseDown} from './core';\r\nimport {Size, BoundsUnmodifiable} from './bounds';\r\nimport {Color, gray} from './color';\r\nimport {newBackgroundPainter, xyFrac_VERTSHADER, solid_FRAGSHADER, putQuadXys} from './misc';\r\nimport {Program, UniformColor, Attribute} from './shader';\r\nimport {newDynamicBuffer} from './buffer';\r\nimport {GL, hasval} from './util/util';\r\n\r\nexport interface VerticalScrollLayout extends Layout {\r\n    jOffset: number;\r\n    hContent: number;\r\n    hVisible: number;\r\n}\r\n\r\n\r\nexport function newVerticalScrollLayout(): VerticalScrollLayout {\r\n    const layout = <VerticalScrollLayout>{\r\n\r\n        updatePrefSize: function (parentPrefSize: Size, children: LayoutEntry[]) {\r\n            if (children.length === 1) {\r\n                const childPrefSize = children[0].prefSize;\r\n\r\n                // XXX: Need some way to override the child's pref-height\r\n                if (!hasval(childPrefSize.h)) {\r\n                    throw new Error('Vertical-scroll layout requires child to have a defined pref-height, but its pref-height is ' + childPrefSize.h);\r\n                }\r\n\r\n                parentPrefSize.w = childPrefSize.w;\r\n                parentPrefSize.h = childPrefSize.h;\r\n            }\r\n            else if (children.length > 1) {\r\n                throw new Error('Vertical-scroll layout only works with 1 child, but pane has ' + this.children.length + ' children');\r\n            }\r\n        },\r\n\r\n        jOffset: 0,\r\n        hContent: 0,\r\n        hVisible: 0,\r\n\r\n        updateChildViewports: function (children: LayoutEntry[], parentViewport: BoundsUnmodifiable) {\r\n            if (children.length === 1) {\r\n                const child = children[0];\r\n\r\n                let j;\r\n                const h = child.prefSize.h;\r\n                if (h <= parentViewport.h) {\r\n                    j = parentViewport.jEnd - h;\r\n                }\r\n                else {\r\n                    j = Math.min(parentViewport.j, parentViewport.jEnd - h + Math.max(0, Math.round(layout.jOffset)));\r\n                }\r\n\r\n                child.viewport.setRect(parentViewport.i, j, parentViewport.w, h);\r\n\r\n                layout.jOffset = (j + h) - parentViewport.jEnd;\r\n                layout.hContent = h;\r\n                layout.hVisible = parentViewport.h;\r\n            }\r\n            else if (children.length > 1) {\r\n                throw new Error('Vertical-scroll layout only works with 1 child, but pane has ' + this.children.length + ' children');\r\n            }\r\n        }\r\n\r\n    };\r\n    return layout;\r\n}\r\n\r\n\r\nexport interface ScrollbarOptions {\r\n    fgColor?: Color;\r\n    bgColor?: Color;\r\n    borderColor?: Color;\r\n    borderThickness?: number;\r\n    borderTop?: boolean;\r\n    borderLeft?: boolean;\r\n    borderRight?: boolean;\r\n    borderBottom?: boolean;\r\n}\r\n\r\n\r\nexport function newVerticalScrollbar(scrollLayout: VerticalScrollLayout, drawable: Drawable, options?: ScrollbarOptions): Pane {\r\n    const bgColor = (hasval(options) && hasval(options.bgColor) ? options.bgColor : gray(0.9));\r\n\r\n    const scrollbar = new Pane(null);\r\n    scrollbar.addPainter(newBackgroundPainter(bgColor));\r\n    scrollbar.addPainter(newVerticalScrollbarPainter(scrollLayout, options));\r\n\r\n    attachVerticalScrollMouseListeners(scrollbar, scrollLayout, drawable);\r\n\r\n    return scrollbar;\r\n}\r\n\r\n\r\nexport function newVerticalScrollbarPainter(scrollLayout: VerticalScrollLayout, options?: ScrollbarOptions): Painter {\r\n    const fgColor = (hasval(options) && hasval(options.fgColor) ? options.fgColor : gray(0.56));\r\n    const borderColor = (hasval(options) && hasval(options.borderColor) ? options.borderColor : gray(0.42));\r\n    const borderThickness = (hasval(options) && hasval(options.borderThickness) ? options.borderThickness : 1);\r\n    const borderTop = (hasval(options) && hasval(options.borderTop) ? options.borderTop : true);\r\n    const borderLeft = (hasval(options) && hasval(options.borderLeft) ? options.borderLeft : false);\r\n    const borderRight = (hasval(options) && hasval(options.borderRight) ? options.borderRight : false);\r\n    const borderBottom = (hasval(options) && hasval(options.borderBottom) ? options.borderBottom : true);\r\n\r\n    const program = new Program(xyFrac_VERTSHADER, solid_FRAGSHADER);\r\n    const u_Color = new UniformColor(program, 'u_Color');\r\n    const a_XyFrac = new Attribute(program, 'a_XyFrac');\r\n\r\n    const numFillVertices = 6;\r\n    const numBorderVertices = (borderTop ? 6 : 0) + (borderLeft ? 6 : 0) + (borderRight ? 6 : 0) + (borderBottom ? 6 : 0);\r\n    const xyFrac = new Float32Array(2 * Math.max(numFillVertices, numBorderVertices));\r\n    const xyFracBuffer = newDynamicBuffer();\r\n\r\n    return function (gl: WebGLRenderingContext, viewport: BoundsUnmodifiable) {\r\n        const hFrac = scrollLayout.hVisible / scrollLayout.hContent;\r\n        if (hFrac < 1) {\r\n            const yTop = Math.round(((scrollLayout.hContent - (scrollLayout.jOffset)) / scrollLayout.hContent) * viewport.h + 1e-4);\r\n            const yBottom = Math.round(((scrollLayout.hContent - (scrollLayout.jOffset + scrollLayout.hVisible)) / scrollLayout.hContent) * viewport.h + 1e-4);\r\n\r\n            const yFracTop = yTop / viewport.h;\r\n            const yFracBottom = yBottom / viewport.h;\r\n\r\n            const wBorderFrac = borderThickness / viewport.w;\r\n            const hBorderFrac = borderThickness / viewport.h;\r\n\r\n            gl.disable(GL.BLEND);\r\n\r\n            program.use(gl);\r\n\r\n\r\n            // Fill\r\n            //\r\n\r\n            putQuadXys(xyFrac, 0, 0 + (borderLeft ? wBorderFrac : 0), 1 - (borderRight ? wBorderFrac : 0), yFracTop - (borderTop ? hBorderFrac : 0), yFracBottom + (borderBottom ? hBorderFrac : 0));\r\n            xyFracBuffer.setData(xyFrac.subarray(0, 2 * numFillVertices));\r\n            a_XyFrac.setDataAndEnable(gl, xyFracBuffer, 2, GL.FLOAT);\r\n            u_Color.setData(gl, fgColor);\r\n            gl.drawArrays(GL.TRIANGLES, 0, numFillVertices);\r\n\r\n\r\n            // Border\r\n            //\r\n\r\n            let index = 0;\r\n            if (borderTop) {\r\n                index = putQuadXys(xyFrac, index, 0, 1 - (borderRight ? wBorderFrac : 0), yFracTop, yFracTop - hBorderFrac);\r\n            }\r\n            if (borderBottom) {\r\n                index = putQuadXys(xyFrac, index, 0 + (borderLeft ? wBorderFrac : 0), 1, yFracBottom + hBorderFrac, yFracBottom);\r\n            }\r\n            if (borderRight) {\r\n                index = putQuadXys(xyFrac, index, 1 - wBorderFrac, 1, yFracTop, yFracBottom + (borderBottom ? hBorderFrac : 0));\r\n            }\r\n            if (borderLeft) {\r\n                index = putQuadXys(xyFrac, index, 0, 0 + wBorderFrac, yFracTop - (borderTop ? hBorderFrac : 0), yFracBottom);\r\n            }\r\n\r\n            xyFracBuffer.setData(xyFrac.subarray(0, 2 * numBorderVertices));\r\n            a_XyFrac.setDataAndEnable(gl, xyFracBuffer, 2, GL.FLOAT);\r\n            u_Color.setData(gl, borderColor);\r\n            gl.drawArrays(GL.TRIANGLES, 0, numBorderVertices);\r\n\r\n\r\n            a_XyFrac.disable(gl);\r\n            program.endUse(gl);\r\n        }\r\n    };\r\n}\r\n\r\n// mouse listener for scrolling while panning on the timeline itself\r\nexport function attachTimelineVerticalScrollMouseListeners(pane: Pane, scrollLayout: VerticalScrollLayout, drawable: Drawable) {\r\n\r\n    // Used when dragging inside pane\r\n    let grab: number = null;\r\n    let jOffset: number = null;\r\n\r\n    pane.mouseDown.on(function (ev: PointerEvent) {\r\n        if (isLeftMouseDown(ev.mouseEvent)) {\r\n            grab = ev.j;\r\n            jOffset = scrollLayout.jOffset;\r\n        }\r\n    });\r\n\r\n    pane.mouseMove.on(function (ev: PointerEvent) {\r\n        if (hasval(grab)) {\r\n            scrollLayout.jOffset = jOffset - (grab - ev.j);\r\n            drawable.redraw();\r\n        }\r\n    });\r\n\r\n    pane.mouseUp.on(function (ev: PointerEvent) {\r\n        grab = null;\r\n    });\r\n}\r\n\r\n// mouse listener for scrolling while interacting with the scrollbar\r\nexport function attachVerticalScrollMouseListeners(scrollbar: Pane, scrollLayout: VerticalScrollLayout, drawable: Drawable) {\r\n\r\n    // Used when dragging the handle\r\n    let grab: number = null;\r\n\r\n    // Used when scrollbar is pressed-and-held outside the handle\r\n    let pageScrollTimer: any = null;\r\n    let recentPointerFrac: number = null;\r\n\r\n    scrollbar.mouseDown.on(function (ev: PointerEvent) {\r\n        if (isLeftMouseDown(ev.mouseEvent) && !hasval(grab)) {\r\n            const topFrac = (scrollLayout.hContent - scrollLayout.jOffset) / scrollLayout.hContent;\r\n            const fracExtent = scrollLayout.hVisible / scrollLayout.hContent;\r\n            const pointerFrac = yFrac(ev);\r\n            if (topFrac - fracExtent <= pointerFrac && pointerFrac <= topFrac) {\r\n                grab = (topFrac - pointerFrac) / fracExtent;\r\n            }\r\n            else {\r\n                // If the mouse is pressed on the scrollbar but outside the handle:\r\n                //\r\n                //  1. Immediately scroll one page toward the mouse\r\n                //  2. Wait 500ms\r\n                //  3. If the mouse-button is still down, scroll one page toward the mouse\r\n                //  4. Wait 50ms\r\n                //  5. Go to Step 3\r\n                //\r\n                // (A \"page\" is 7/8 of the viewport extent.)\r\n                //\r\n\r\n                let direction = 0;\r\n                if (pointerFrac < topFrac - fracExtent) {\r\n                    direction = +1;\r\n                }\r\n                else if (pointerFrac > topFrac) {\r\n                    direction = -1;\r\n                }\r\n                scrollLayout.jOffset += direction * Math.max(1, 0.875 * scrollLayout.hVisible);\r\n                drawable.redraw();\r\n\r\n                recentPointerFrac = pointerFrac;\r\n                const pageScroll = function () {\r\n                    const pageTopFrac = (scrollLayout.hContent - scrollLayout.jOffset) / scrollLayout.hContent;\r\n                    const pageFracExtent = scrollLayout.hVisible / scrollLayout.hContent;\r\n                    const pagePointerFrac = recentPointerFrac;\r\n\r\n                    let pageDirection = 0;\r\n                    if (pagePointerFrac < pageTopFrac - pageFracExtent) {\r\n                        pageDirection = +1;\r\n                    }\r\n                    else if (pagePointerFrac > pageTopFrac) {\r\n                        pageDirection = -1;\r\n                    }\r\n                    scrollLayout.jOffset += pageDirection * Math.max(1, 0.875 * scrollLayout.hVisible);\r\n                    drawable.redraw();\r\n\r\n                    pageScrollTimer = setTimeout(pageScroll, 50);\r\n                };\r\n                pageScrollTimer = setTimeout(pageScroll, 500);\r\n            }\r\n        }\r\n    });\r\n\r\n    scrollbar.mouseMove.on(function (ev: PointerEvent) {\r\n        const pointerFrac = yFrac(ev);\r\n        if (hasval(grab)) {\r\n            const fracExtent = scrollLayout.hVisible / scrollLayout.hContent;\r\n            const topFrac = pointerFrac + grab * fracExtent;\r\n            scrollLayout.jOffset = scrollLayout.hContent - topFrac * scrollLayout.hContent;\r\n            drawable.redraw();\r\n        }\r\n        if (hasval(pageScrollTimer)) {\r\n            recentPointerFrac = pointerFrac;\r\n        }\r\n    });\r\n\r\n    scrollbar.mouseUp.on(function (ev: PointerEvent) {\r\n        grab = null;\r\n        if (hasval(pageScrollTimer)) {\r\n            clearTimeout(pageScrollTimer);\r\n            pageScrollTimer = null;\r\n            recentPointerFrac = null;\r\n        }\r\n    });\r\n\r\n}\r\n\r\n\r\n"]}