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goodbye.js
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// # Copyright (c) 2022 Feudal Code Limitada #
// MIT License
/*
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/*
* This software creates canvas boxes, that you may use to produce a full HTML page (or part(s) of it).
*
* A great advantage of this approach is that the final result is 100% under your control.
*
* This code is (obviously) not compressed. It is up to you compress it or not.
*
* This software tries to protect itself from the developer mistakes, throwing errors.
*
* All args of any function are mandatory.
*
*
* More info about it at
*
* https://javascript.plainenglish.io/goodbye-html-hello-canvas-part-1-92f750961666
*
*/
"use strict"
function createGoodbyeHtmlLibrary() {
// [[source/globals.js]] ######################################################
const allImages = { }
const allFonts = { }
let resourcesToLoad = 0
let fileSelector = null
let downloadLink = null
// [[source/alert-confirm-prompt.js]] #########################################
// UNDER CONSTRUCTION //
///////////////////////////////////////////////////////////////////////////////
function setFontsForSpecialLayers(__fontId1, __fontId2) {
//
}
///////////////////////////////////////////////////////////////////////////////
// [[source/assure.js]] #######################################################
///////////////////////////////////////////////////////////////////////////////
function argError(param, func, txt) {
//
let msg = "-- wrong argument " + param + " for function " + func
//
if (txt) { msg += ": " + txt}
//
throw(msg)
}
///////////////////////////////////////////////////////////////////////////////
function assureBoolean(param, func, val) {
//
if (val === true || val === false) { return }
//
argError(param, func, "expecting boolean, got: " + val)
}
///////////////////////////////////////////////////////////////////////////////
function __assureNumber(param, func, val) {
//
const msg = "expecting number, got: " + val
//
if (isNaN(val)) { argError(param, func, msg) }
//
if (typeof(val) == "string") { argError(param, func, msg.replace("got:", "got string:")) }
//
if (typeof(val) != "number") { argError(param, func, msg) }
}
///////////////////////////////////////////////////////////////////////////////
function assureInteger(param, func, val) {
//
const msg = "expecting integer, got: " + val
//
if (isNaN(val)) { argError(param, func, msg) }
//
if (typeof(val) == "string") { argError(param, func, msg.replace("got:", "got string:")) }
//
if (typeof(val) != "number") { argError(param, func, msg) }
//
if (Math.floor(val) !== val) { argError(param, func, msg) }
}
///////////////////////////////////////////////////////////////////////////////
function assureThisInteger(param, func, val, ref) {
//
const msg = "expecting integer == " + ref + ", got: " + val
//
if (isNaN(val)) { argError(param, func, msg) }
//
if (typeof(val) == "string") { argError(param, func, msg.replace("got:", "got string:")) }
//
if (typeof(val) != "number") { argError(param, func, msg) }
//
if (Math.floor(val) !== val) { argError(param, func, msg) }
//
if (val != ref) { argError(param, func, msg) }
}
///////////////////////////////////////////////////////////////////////////////
function assureMinimumInteger(param, func, val, min) {
//
const msg = "expecting integer >= " + min + ", got: " + val
//
if (isNaN(val)) { argError(param, func, msg) }
//
if (typeof(val) == "string") { argError(param, func, msg.replace("got:", "got string:")) }
//
if (typeof(val) != "number") { argError(param, func, msg) }
//
if (Math.floor(val) !== val) { argError(param, func, msg) }
//
if (val < min) { argError(param, func, msg) }
}
///////////////////////////////////////////////////////////////////////////////
function assureProportion(param, func, val) {
//
const msg = "expecting number >= 0 and <= 1, got: " + val
//
if (isNaN(val)) { argError(param, func, msg) }
//
if (typeof(val) == "string") { argError(param, func, msg.replace("got:", "got string:")) }
//
if (typeof(val) != "number") { argError(param, func, msg) }
//
if (val < 0) { argError(param, func, msg) }
if (val > 1) { argError(param, func, msg) }
}
///////////////////////////////////////////////////////////////////////////////
function assureString(param, func, val) {
//
if (typeof val != "string") { argError(param, func, "expecting string, got: " + val) }
}
function assureNonEmptyString(param, func, val) {
//
assureString(param, func, val)
//
if (val == "") { argError(param, func, "got empty string") }
}
///////////////////////////////////////////////////////////////////////////////
function assureList(param, func, val) {
//
if (! Array.isArray(val)) { argError(param, func, "expecting list, got: " + val) }
}
function assureNonEmptyList(param, func, val) {
//
assureList(param, func, val)
//
if (val.length == 0) { argError(param, func, "got empty list") }
}
///////////////////////////////////////////////////////////////////////////////
function assureNullOrFunction(param, func, val) {
//
if (val === null) { return }
if (typeof val == "function") { return }
//
argError(param, func, "expecting null or function, got: " + val)
}
///////////////////////////////////////////////////////////////////////////////
function assureImage(param, func, val) {
//
if (val == "") { argError(param, func, "expecting image, got empty string") }
//
if (typeof val != "object") { argError(param, func, "expecting image, got: " + val) }
//
if (val.src) { return } // image
//
if (val.getContext) { return } // canvas
//
argError(param, func, "expecting image, got: " + val)
}
///////////////////////////////////////////////////////////////////////////////
function assureColor(param, func, val) {
//
if (! isColor(val)) { argError(param, func, "invalid color: " + val) }
}
function assureSolidColor(param, func, val) {
//
assureColor(param, func, val)
//
if (! isSolidColor(val)) { argError(param, func, "not a solid color: " + val) }
}
///////////////////////////////////////////////////////////////////////////////
function assureName(param, func, val) {
//
if (typeof val != "string") { argError(param, func, "expecting name, got: " + val) }
//
if (val == "") { argError(param, func, "expecting name, got empty string") }
//
if (val != val.toLowerCase()) {
//
argError(param, func, "upper case letter(s) in name: " + val)
}
//
if (val[0] < "a" || val[0] > "z") {
//
argError(param, func, "name not starting with letter: " + val)
}
//
for (const c of val) {
//
if (c >= "a" && c <= "z") { continue }
if (c >= "0" && c <= "9") { continue }
if (c != "-") {
//
argError(param, func, "invalid character '" + c + "' in name: " + val)
}
}
//
return val
}
///////////////////////////////////////////////////////////////////////////////
function assureGoodId(param, func, val, dict) {
//
if (typeof val != "string") { argError(param, func, "expecting string, got: " + val) }
//
if (val == "") { argError(param, func, "got empty string") }
//
if (dict[val] == undefined) { argError(param, func, "unknown: " + val) }
}
///////////////////////////////////////////////////////////////////////////////
function assureFreeId(param, func, val, dict) {
//
if (typeof val != "string") { argError(param, func, "expecting string, got: " + val) }
//
if (val == "") { argError(param, func, "got empty string") }
//
if (dict[val] != undefined) { argError(param, func, "already used id: " + val) }
}
// [[source/box.js]] ##########################################################
///////////////////////////////////////////////////////////////////////////////
function mainLoop(box) {
//
box.loop += 1
//
updateBlinking(box)
//
if (box.shallRepaint) { paintStage(box); box.shallRepaint = false }
//
setTimeout(function () { mainLoop(box) }, 16)
}
///////////////////////////////////////////////////////////////////////////////
function Box(width, height, parent) {
//
this.width = width
this.height = height
this.bgColor = "black"
//
this.parent = parent
//
this.stage = null
this.stageCtx = null
//
this.layers = [ ]
//
this.elements = { }
//
this.focusedWidget = null
this.lastWidgetUnderMouse = null
//
this.blinking = false // means the red phase of blinking
this.blinkingClock = 0
//
this.loop = 0
this.shallRepaint = true
}
///////////////////////////////////////////////////////////////////////////////
function createBox(width, height, parent) {
//
assureMinimumInteger("width", "createBox", width, 30)
//
assureMinimumInteger("height", "createBox", height, 30)
//
if (parent.appendChild == undefined) { throw "-- invalid parent for the box: missing appendChild" }
//
const box = new Box(width, height, parent)
Object.seal(box)
//
createStage(box)
//
box.stage.tabIndex = "-1"
box.stage.onkeydown = function (e) { keyDownHandler(box, e) }
//
return createBoxUser(box)
}
///////////////////////////////////////////////////////////////////////////////
function createBoxUser(box) {
//
const boxUser = { }
//
boxUser["setBgColor"] = function (color) { setStageBgColor(box, color) }
//
boxUser["initLayers"] = function (names) { initLayers(box, names) }
//
boxUser["getOrderOfLayers"] = function () { return orderOfLayers(box) }
//
boxUser["get"] = function (id) { return getUser(box, id) }
//
boxUser["resetFocus"] = function () { resetFocus(box) }
//
boxUser["log"] = function () { console.log(box) }
//
Object.freeze(boxUser)
//
return boxUser
}
///////////////////////////////////////////////////////////////////////////////
function getUser(box, id) {
//
assureString("id", "box.get", id)
//
const element = box.elements[id]
//
if (element == undefined) { throw "no element matches this id: " + id }
//
return element
}
///////////////////////////////////////////////////////////////////////////////
function setFocus(box, widget) {
//
if (widget == null) { box.focusedWidget = null; return }
//
if (widget.kind == "textbox") { box.focusedWidget = widget }
}
function resetFocus(box) {
//
box.blinking = false
//
const widget = box.focusedWidget
//
box.focusedWidget = null
//
if (widget == null) { return }
//
if (widget.kind == "textbox") { paintTextbox(widget) }
}
///////////////////////////////////////////////////////////////////////////////
function startBlinking(widget) { // must be the box.focusedWidget
//
const box = widget.panel.layer.box
//
box.blinking = true
//
box.blinkingClock = box.loop + blinkingDuration(box.blinking)
//
paintTextbox(widget)
}
function updateBlinking(box) {
//
if (box.blinkingClock != box.loop) { return }
//
const widget = box.focusedWidget
//
if (widget == null) { return }
//
if (widget.kind != "textbox") { return }
//
box.blinking = ! box.blinking
box.blinkingClock = box.loop + blinkingDuration(box.blinking)
//
paintTextbox(widget)
}
function blinkingDuration(blinking) {
//
return blinking ? 40 : 30
}
// [[source/button.js]] #######################################################
///////////////////////////////////////////////////////////////////////////////
function Button(panel, id, left, top, width, height, bgColor) {
//
this.panel = panel
//
this.kind = "button"
//
this.id = id
//
this.left = left
this.top = top
this.width = width
this.height = height
//
this.text = null
this.fontId = null
//
this.visible = true
//
this.bgColor = bgColor
//
this.pressed = false
this.disabled = false
this.active = false
//
this.imageNormal = createColorCanvas(width, height, bgColor)
this.imageActive = createColorCanvas(width, height, bgColor)
this.imagePressed = createColorCanvas(width, height, solidReversedColor(bgColor))
this.imageDisabled = createColorCanvas(width, height, bgColor)
//
this.onmouseup = function () { buttonOnMouseUp(this) }
this.onmousedown = function () { buttonOnMouseDown(this) }
this.onmouseleave = function () { buttonOnMouseLeave(this) }
this.onclick = null
}
///////////////////////////////////////////////////////////////////////////////
function createButton(panel, name, left, top, width, height, bgColor) {
//
const box = panel.layer.box
//
box.shallRepaint = true
//
const func = "panel.createButton"
//
assureName("name", func, name)
//
const id = panel.id + "." + name
//
assureFreeId("name", func, id, box.elements)
//
assureMinimumInteger("left", func, left, 0)
//
assureMinimumInteger("top", func, top, 0)
//
assureMinimumInteger("width", func, width, 1)
//
assureMinimumInteger("height", func, height, 1)
//
assureSolidColor("bgColor", func, bgColor)
//
const button = new Button(panel, id, left, top, width, height, bgColor)
//
Object.seal(button)
//
assureWidgetFitsInPanel(button)
assureWidgetDoesntClash(button)
//
panel.widgets.push(button)
//
box.elements[id] = createButtonUserObj(button)
//
paintButton(button)
//
return box.elements[id]
}
///////////////////////////////////////////////////////////////////////////////
function createButtonUserObj(button) {
//
const obj = { }
//
obj["hide"] = function () { button.visible = false; paintButton(button) }
obj["show"] = function () {button.visible = true; paintButton(button) }
//
obj["getVisible"] = function () { return button.visible }
//
obj["setImageNormal"] = function (img) { setButtonImageNormal(button, img) }
obj["setImageActive"] = function (img) { setButtonImageActive(button, img) }
obj["setImagePressed"] = function (img) { setButtonImagePressed(button, img) }
obj["setImageDisabled"] = function (img) { setButtonImageDisabled(button, img) }
//
obj["enable"] = function () { button.disabled = false; button.pressed = false; paintButton(button) }
obj["disable"] = function () { button.disabled = true; button.pressed = false; paintButton(button) }
//
obj["getDisabled"] = function () { return button.disabled }
//
obj["activate"] = function () { button.disabled = false; button.pressed = false; button.active = true; paintButton(button) }
obj["deactivate"] = function () { button.disabled = false; button.pressed = false; button.active = false; paintButton(button) }
//
obj["getActive"] = function () { return button.active }
//
obj["setBgColor"] = function (color) { setButtonBgColor(button, color) }
//
obj["setText"] = function (fontId, text) { setButtonText(button, fontId, text) }
//
obj["setOnClick"] = function (handler) { setButtonOnClick(button, handler) }
//
obj["config"] = function (fontId, text, onclick) { configButton(button, fontId, text, onclick) }
//
obj["log"] = function () { console.log(button) }
//
Object.freeze(obj)
return obj
}
///////////////////////////////////////////////////////////////////////////////
function paintButton(button) {
//
clearPanelUnderWidget(button)
//
if (! button.visible) { return }
//
const img = getButtonImage(button)
//
button.panel.context.drawImage(img, button.left, button.top)
}
///////////////////////////////////////////////////////////////////////////////
function setButtonBgColor(button, color) {
//
assureSolidColor("color", "button.setBgColor", color)
//
button.bgColor = color
//
paintButton(button)
}
///////////////////////////////////////////////////////////////////////////////
function getButtonImage(button) {
//
if (button.pressed) { return button.imagePressed }
//
if (button.disabled) { return button.imageDisabled }
//
if (button.active) { return button.imageActive }
//
return button.imageNormal
}
///////////////////////////////////////////////////////////////////////////////
function setButtonImageNormal(button, img) {
//
assureImage("img", "button.setImageNormal", img)
//
button.imageNormal = adjustedImage(img, button.width, button.height)
//
paintButton(button)
}
function setButtonImageActive(button, img) {
//
assureImage("img", "button.setImageActive", img)
//
button.imageActive = adjustedImage(img, button.width, button.height)
//
paintButton(button)
}
function setButtonImagePressed(button, img) {
//
assureImage("img", "button.setImagePressed", img)
//
button.imagePressed = adjustedImage(img, button.width, button.height)
//
paintButton(button)
}
function setButtonImageDisabled(button, img) {
//
assureImage("img", "button.setImageDisabled", img)
//
button.imageDisabled = adjustedImage(img, button.width, button.height)
//
paintButton(button)
}
///////////////////////////////////////////////////////////////////////////////
function setButtonOnClick(button, handler) {
//
assureNullOrFunction("handler", "button.setOnClick", handler)
//
button.onclick = handler
}
///////////////////////////////////////////////////////////////////////////////
function buttonOnMouseDown(button) {
//
if (button.disabled) { return }
//
button.pressed = true
paintButton(button)
}
function buttonOnMouseLeave(button) {
//
if (button.pressed) {
//
button.pressed = false
paintButton(button)
}
}
function buttonOnMouseUp(button) {
//
if (button.pressed) {
//
button.pressed = false
paintButton(button)
//
if (button.onclick) { button.onclick() }
}
}
// [[source/button-config.js]] ################################################
///////////////////////////////////////////////////////////////////////////////
function setButtonText(button, fontId, text) {
//
const func = "button.setText"
//
assureGoodId("fontId", func, fontId, allFonts)
//
assureString("text", func, text)
//
setButtonTextCore(button, fontId, text)
}
///////////////////////////////////////////////////////////////////////////////
function configButton(button, fontId, text, onclick) {
//
const func = "button.config"
//
assureGoodId("fontId", func, fontId, allFonts)
//
assureString("text", func, text)
//
assureNullOrFunction("onclick", func, onclick)
//
button.onclick = onclick
//
setButtonTextCore(button, fontId, text)
}
///////////////////////////////////////////////////////////////////////////////
function setButtonTextCore(button, fontId, text) {
//
button.text = text
//
const img = createLabel(fontId, "transparent", button.width, button.height, button.text)
//
const grey = getGreyFromString(button.bgColor)
//
const dark = grey < 160
//
button.imageNormal = makeButtonTextNormal(button, img, dark)
button.imageDisabled = makeButtonTextDisabled(button)
button.imagePressed = makeButtonImagePressed(button, dark)
//
paintButton(button)
}
///////////////////////////////////////////////////////////////////////////////
function makeButtonTextNormal(button, img, dark) {
//
const width = button.width
const height = button.height
//
const cnv = createCanvas(width, height)
const ctx = cnv.getContext("2d")
//
ctx.fillStyle = button.bgColor
ctx.fillRect(0, 0, width, height)
//
ctx.fillStyle = dark ? "rgba(255,255,255,0.3)" : "rgba(0,0,0,0.2)"
//
ctx.fillRect(2, 0, button.width - 4, 2) // top border without corners
ctx.fillRect(2, button.height - 2, button.width - 4, 2) // bottom border without corners
//
ctx.fillRect(0, 0, 2, button.height) // full left border
ctx.fillRect(button.width - 2, 0, 2, button.height) // full right border
//
ctx.drawImage(img, 0, 0)
//
return cnv
}
///////////////////////////////////////////////////////////////////////////////
function makeButtonTextDisabled(button) {
//
const width = button.width
const height = button.height
//
const cnv = createCanvas(width, height)
const ctx = cnv.getContext("2d")
//
ctx.fillStyle = "black"
//
ctx.fillRect(0, 0, width, height)
//
ctx.globalAlpha = 0.5
ctx.drawImage(button.imageNormal, 0, 0)
ctx.globalAlpha = 1
//
return cnv
}
///////////////////////////////////////////////////////////////////////////////
function makeButtonImagePressed(button, dark) {
//
const width = button.width
const height = button.height
//
const cnv = createCanvas(width, height)
const ctx = cnv.getContext("2d")
//
ctx.fillStyle = button.bgColor
ctx.fillRect(0, 0, width, height)
//
ctx.fillStyle = dark ? "rgba(255,255,255,0.3)" : "rgba(0,0,0,0.2)"
//
ctx.fillRect(2, 0, button.width - 4, 2) // top border without corners
ctx.fillRect(2, button.height - 2, button.width - 4, 2) // bottom border without corners
//
ctx.fillRect(0, 0, 2, button.height) // full left border
ctx.fillRect(button.width - 2, 0, 2, button.height) // full right border
//
return cnv
}
// [[source/checkbox.js]] #####################################################
///////////////////////////////////////////////////////////////////////////////
function Checkbox(panel, id, left, top, dimension, checked, onclick) {
//
this.panel = panel
//
this.kind = "checkbox"
//
this.id = id
//
this.left = left
this.top = top
this.width = dimension
this.height = dimension
//
this.checked = checked
//
this.visible = true
//
this.pressed = false
this.disabled = false
//
this.imageChecked = null
this.imageUnchecked = null
this.fadeCover = null
//
this.onmouseup = function () { checkboxOnMouseUp(this) }
this.onmousedown = function () { checkboxOnMouseDown(this) }
this.onmouseleave = function () { checkboxOnMouseLeave(this) }
this.onclick = onclick
}
///////////////////////////////////////////////////////////////////////////////
function createCheckbox(panel, name, left, top, dimension, checked, onclick) {
//
const box = panel.layer.box
//
box.shallRepaint = true
//
const func = "panel.createCheckbox"
//
assureName("name", func, name)
//
const id = panel.id + "." + name
//
assureFreeId("name", func, id, box.elements)
//
assureMinimumInteger("left", func, left, 0)
//
assureMinimumInteger("top", func, top, 0)
//
assureMinimumInteger("dimension", func, dimension, 12)
//
assureBoolean("checked", func, checked)
//
assureNullOrFunction("onclick", func, onclick)
//
const checkbox = new Checkbox(panel, id, left, top, dimension, checked, onclick)
//
Object.seal(checkbox)
//
setCheckboxImages(checkbox)
//
assureWidgetFitsInPanel(checkbox)
assureWidgetDoesntClash(checkbox)
//
panel.widgets.push(checkbox)
//
box.elements[id] = createCheckboxUserObj(checkbox)
//
paintCheckbox(checkbox)
//
return box.elements[id]
}
///////////////////////////////////////////////////////////////////////////////
function createCheckboxUserObj(checkbox) {
//
const obj = { }
//
obj["hide"] = function () { checkbox.visible = false; paintCheckbox(checkbox) }
obj["show"] = function () { checkbox.visible = true; paintCheckbox(checkbox) }
//
obj["getVisible"] = function () { return checkbox.visible }
//
obj["enable"] = function () { checkbox.disabled = false; paintCheckbox(checkbox) }
obj["disable"] = function () { checkbox.disabled = true; paintCheckbox(checkbox) }
//
obj["setOnClick"] = function (handler) { setCheckboxOnClick(checkbox, handler) }
//
obj["getChecked"] = function () { return checkbox.checked }
//
obj["getDisabled"] = function () { return checkbox.disabled }
//
obj["log"] = function () { console.log(checkbox) }
//
Object.freeze(obj)
return obj
}
///////////////////////////////////////////////////////////////////////////////
function setCheckboxImages(checkbox) {
//
const dim = checkbox.width
//
const grey = getGreyFromString(checkbox.panel.bgColor)
//
const dark = grey < 60
const color = fadeColor(dark ? "black" : "white", 0.7)
//
checkbox.imageChecked = createCheckedImage(dim, dark)
checkbox.imageUnchecked = createUncheckedImage(dim, dark)
checkbox.fadeCover = createColorCanvas(dim, dim, color)
}
///////////////////////////////////////////////////////////////////////////////
function paintCheckbox(checkbox) {
//
clearPanelUnderWidget(checkbox)
//
if (! checkbox.visible) { return }
//
const img = checkbox.checked ? checkbox.imageChecked : checkbox.imageUnchecked
//
checkbox.panel.context.drawImage(img, checkbox.left, checkbox.top)
//
if (checkbox.disabled) { checkbox.panel.context.drawImage(checkbox.fadeCover, checkbox.left, checkbox.top) }
}
///////////////////////////////////////////////////////////////////////////////
function createUncheckedImage(dim, dark) {
//
const cnv = createCanvas(dim, dim)
const ctx = cnv.getContext("2d")
//
ctx.fillStyle = dark ? "dimgrey" : "black"
ctx.fillRect(0, 0, dim, dim)
//
ctx.fillStyle = dark ? "lightgrey" : "gainsboro"
ctx.fillRect(1, 1, dim-2, dim-2)
//
return cnv
}
function createCheckedImage(dim, dark) {
//
const cnv = createUncheckedImage(dim, dark)
const ctx = cnv.getContext("2d")
//
if (dark) {
ctx.fillStyle = "dimgrey"
ctx.fillRect(4, 4, dim-8, dim-8)
}
else {
ctx.fillStyle = "black"
ctx.fillRect(2, 2, dim-4, dim-4)
}
//
return cnv
}
///////////////////////////////////////////////////////////////////////////////
function setCheckboxOnClick(checkbox, handler) {
//
assureNullOrFunction("handler", "checkbox.setOnClick", handler)
//
checkbox.onclick = handler
}