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a-doc-editor
Commit 06b575de by ramdayalmunda
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caret render issue resolved

parent 4dd4e821
Showing with 34 additions and 39 deletions
dist/assets/a-doc-editor.js
......@@ -37,35 +37,15 @@ var ADocEditor = function (customConfig) {
id: ++counter,
type: 0,
formatedText: [],
plainContent: "Rendering text in HTML canvas involves using the CanvasRenderingContext2D interface to display text content within a canvas element. This process allows for dynamic text display, enabling the creation of custom text effects, labels, captions, or textual elements within the canvas.",
style: { ...config.style }
},
{
id: ++counter,
type: 0,
plainContent: "To render text on a canvas, developers typically use the fillText() method provided by the Canvas API. This method allows the specification of text content, font styles, position, and color. Additionally, the measureText() method helps in determining the width of text, facilitating accurate positioning and layout arrangements.",
style: { ...config.style }
},
{
id: ++counter,
type: 0,
plainContent: "Text in canvas can be customized by setting various font properties like font family, font size, style (bold, italic), alignment, and color. However, canvas text rendering lacks the text reflow and responsive layout capabilities inherent in HTML and CSS.",
style: { ...config.style }
},
{
id: ++counter,
type: 0,
plainContent: "Despite its intricacies, canvas text rendering offers unparalleled creative freedom, enabling the development of immersive graphical experiences, custom typography, and visually stunning representations that enhance user engagement and interactivity within web-based applications and games.",
style: { ...config.style }
},
{
id: ++counter,
type: 0,
plainContent: "Developers often use canvas text rendering to create graphical representations of text-based information, such as game interfaces, data visualizations, charts, and diagrams. Despite its flexibility in text manipulation and artistic possibilities, rendering text in canvas may require additional manual adjustments for formatting, spacing, and alignment compared to traditional HTML text rendering.",
plainContent: "",
style: { ...config.style }
},
]
// // these lines are added only for testing please remove this on completion
// // paragraphs
dataSet = JSON.parse( '[{"id":1,"type":0,"formatedText":[],"plainContent":"Rendering text in HTML canvas involves using the CanvasRenderingContext2D interface to display text content within a canvas element. This process allows for dynamic text display, enabling the creation of custom text effects, labels, captions, or textual elements within the canvas.","style":{"fontSize":30,"fontFamily":"Arial","bold":false,"italic":false,"fontColor":"#001"}},{"id":2,"type":0,"plainContent":"To render text on a canvas, developers typically use the fillText() method provided by the Canvas API. This method allows the specification of text content, font styles, position, and color. Additionally, the measureText() method helps in determining the width of text, facilitating accurate positioning and layout arrangements.","style":{"fontSize":30,"fontFamily":"Arial","bold":false,"italic":false,"fontColor":"#001"}},{"id":3,"type":0,"plainContent":"Text in canvas can be customized by setting various font properties like font family, font size, style (bold, italic), alignment, and color. However, canvas text rendering lacks the text reflow and responsive layout capabilities inherent in HTML and CSS.","style":{"fontSize":30,"fontFamily":"Arial","bold":false,"italic":false,"fontColor":"#001"}},{"id":4,"type":0,"plainContent":"Despite its intricacies, canvas text rendering offers unparalleled creative freedom, enabling the development of immersive graphical experiences, custom typography, and visually stunning representations that enhance user engagement and interactivity within web-based applications and games.","style":{"fontSize":30,"fontFamily":"Arial","bold":false,"italic":false,"fontColor":"#001"}},{"id":5,"type":0,"plainContent":"Developers often use canvas text rendering to create graphical representations of text-based information, such as game interfaces, data visualizations, charts, and diagrams. Despite its flexibility in text manipulation and artistic possibilities, rendering text in canvas may require additional manual adjustments for formatting, spacing, and alignment compared to traditional HTML text rendering.","style":{"fontSize":30,"fontFamily":"Arial","bold":false,"italic":false,"fontColor":"#001"}}]')
var lines = []
var caretData = {
......@@ -78,6 +58,7 @@ var ADocEditor = function (customConfig) {
caretSize: config.style.fontSize,
x: config.format.margin,
y: config.format.margin + (3 * config.style.fontSize / 4),
previousCaret: null,
}
var renderInProgress = false;
......@@ -163,7 +144,7 @@ var ADocEditor = function (customConfig) {
reRenderPages(dataSet)
}
function reRenderPages(dataList) {
function reRenderPages(dataList, option) {
if (renderInProgress) return
renderInProgress = true
......@@ -188,6 +169,9 @@ var ADocEditor = function (customConfig) {
}
renderTheLines()
if (!caretData.blink && caretData.activeData) renderCaret()
function calculateTextSizeAndPosition(canvasIndex, dataSetIndex) {
let dataBlock = dataList[dataSetIndex]
......@@ -199,7 +183,6 @@ var ADocEditor = function (customConfig) {
let dataLineArr = []
function getLineObj() {
return {
id: ++counter,
x: 0, // this is the starting point x; it will change based on the tabNumber
y: 0, // this is the starting y coordinate; it will change based on the max font size
plainContent: "",
......@@ -237,6 +220,7 @@ var ADocEditor = function (customConfig) {
}
lineObj.maxFontSize = style.fontSize
// lineObj.fontSize = style.fontSize
tempLineWidth += charWidth
if (tempLineWidth <= maxLineWidth) {
// can be added to the line //
......@@ -284,7 +268,6 @@ var ADocEditor = function (customConfig) {
if (lines[l].blockStart && l != 0) y += lines[l].maxFontSize
if ((maxVericalWidth + lines[l].maxFontSize) < (y - lines[l].maxFontSize)) {
canvasIndex++
lines[l].canvasIndex = canvasIndex
if (!canvasList[canvasIndex]) {
canvasList[canvasIndex] = { id: ++counter, el: createCanvas(), dataIndex: lines[l].dataSetIndex, lineIndex: l }
}
......@@ -293,6 +276,7 @@ var ADocEditor = function (customConfig) {
}
lines[l].y = y
lines[l].x = x
lines[l].canvasIndex = canvasIndex
let setData = dataSet[lines[l].dataSetIndex]
for (let c = lines[l].charStartIndex; c < lines[l].charEndIndex; c++) {
......@@ -315,17 +299,21 @@ var ADocEditor = function (customConfig) {
}
}
if (!caretData.blink && caretData.activeData) renderCaret()
// to render caret
function renderCaret() {
let ctx = canvasList[caretData.canvasIndex].el.getContext('2d', { willReadFrequently: true })
ctx.save()
let rectX = 0, rectY = 0, rectWidth = 2, rectHeight = 5 * config.style.fontSize / 4;
if (caretData.caretIndex == 0) {
// pick style from line
} else {
// pick style for previous character
}
let activeDataIndex = dataSet.findIndex( item => item.id == caretData.activeData.id )
let activeLine = lines.find( item => item.dataSetIndex == activeDataIndex && item.charEndIndex>caretData.index )
let characterData = dataSet[activeDataIndex].formatedText[ caretData.index ]
let rectX = characterData?characterData.x:activeLine.x,
rectY = activeLine.y-activeLine.maxFontSize,
rectWidth = 2,
rectHeight = 5 * activeLine.maxFontSize / 4;
const imageData = ctx.getImageData(rectX, rectY, rectWidth, rectHeight);
const data = imageData.data;
......@@ -361,8 +349,8 @@ var ADocEditor = function (customConfig) {
ctx.fillRect(0, 0, canvas.width, canvas.height)
canvas.addEventListener('keydown', keydownHandler)
canvas.addEventListener('mousedown', mousedownHandler)
canvas.addEventListener("focus", onFocusHandler)
canvas.addEventListener("blur", onBlurHandler)
// canvas.addEventListener("focus", onFocusHandler)
// canvas.addEventListener("blur", onBlurHandler)
canvas.setAttribute("tabIndex", -1)
scrollingComponent.append(canvas)
return canvas
......@@ -386,8 +374,8 @@ var ADocEditor = function (customConfig) {
caretData.blink = false
if (e.shiftKey && e.ctrlKey) { } // ctr+shift combination
else if (e.ctrlKey) {
if (e.shiftKey && (e.ctrlKey || e.metaKey)) { } // ctr+shift combination
else if (e.ctrlKey || e.metaKey) {
if (e.keyCode == 8) { // ctrl+backspace: delete the entrite word
let separatedSentence = caretData.activeData.plainContent.slice(0, caretData.index)
let indexOfpreviousBlankChar = separatedSentence.search(/[^a-zA-Z0-9](?=[a-zA-Z0-9]*$)/)
......@@ -435,9 +423,13 @@ var ADocEditor = function (customConfig) {
caretData.activeData = previousData
caretData.index = previousData.plainContent.length
}
caretData.canvasIndex = canvasList.findIndex( item => item.el == e.target )
} else {
caretData.index = (caretData.index <= 0) ? 0 : caretData.index - 1
}
reRenderPages(dataSet, { onlyCursor: true })
return
}
else if (e.keyCode == 38) { // up key
e.preventDefault()
......@@ -455,6 +447,9 @@ var ADocEditor = function (customConfig) {
}
}
caretData.canvasIndex = canvasList.findIndex( item => item.el == e.target )
reRenderPages(dataSet, { onlyCursor: true })
return
}
else if (e.keyCode == 40) { // down key
e.preventDefault()
......
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