UX: Wizard style preview improvements

* Render date on timeline
* Render timeline handle thicker and with a small gap at top
* Make sure body text does not overflow over timeline with
  bounding box calculation and dymanic font resizing
* Other minor improvements to spacing/sizing

app/assets/javascripts/discourse/app/static/wizard/components/fields/styling-preview/-preview-base.js

@@ -248,17 +248,20 @@ export default class PreviewBase extends Component {
     ctx.drawImage(scaled[key], x, y, w, h);
   }
 
+  get headerHeight() {
+    return this.height * 0.15;
+  }
+
   drawFullHeader(colors, font, logo) {
     const { ctx } = this;
 
-    const headerHeight = this.height * 0.15;
-    drawHeader(ctx, colors, this.width, headerHeight);
+    drawHeader(ctx, colors, this.width, this.headerHeight);
 
     const avatarSize = this.height * 0.1;
-    const headerMargin = headerHeight * 0.2;
+    const headerMargin = this.headerHeight * 0.2;
 
     if (logo) {
-      const logoHeight = headerHeight - headerMargin * 2;
+      const logoHeight = this.headerHeight - headerMargin * 2;
 
       const ratio = logoHeight / logo.height;
       this.scaleImage(
@@ -285,7 +288,7 @@ export default class PreviewBase extends Component {
       colors.primary_low_mid ||
       darkLightDiff(colors.primary, colors.secondary, 45, 55);
 
-    const pathScale = headerHeight / 1200;
+    const pathScale = this.headerHeight / 1200;
     // search icon SVG path
     const searchIcon = new Path2D(
       "M505 442.7L405.3 343c-4.5-4.5-10.6-7-17-7H372c27.6-35.3 44-79.7 44-128C416 93.1 322.9 0 208 0S0 93.1 0 208s93.1 208 208 208c48.3 0 92.7-16.4 128-44v16.3c0 6.4 2.5 12.5 7 17l99.7 99.7c9.4 9.4 24.6 9.4 33.9 0l28.3-28.3c9.4-9.4 9.4-24.6.1-34zM208 336c-70.7 0-128-57.2-128-128 0-70.7 57.2-128 128-128 70.7 0 128 57.2 128 128 0 70.7-57.2 128-128 128z"
@@ -390,6 +393,29 @@ export default class PreviewBase extends Component {
     x += categoriesSize * 0.6;
     ctx.fillText("Top", x, headerHeight + headerMargin * 1.5 + fontSize);
   }
+
+  resizeTextLinesToFitRect(
+    textLines,
+    rectWidth,
+    ctx,
+    fontSize,
+    font,
+    renderCallback
+  ) {
+    const maxLengthLine = textLines.reduce((a, b) =>
+      a.length > b.length ? a : b
+    );
+
+    let fontSizeDecreaseMultiplier = 1;
+    while (ctx.measureText(maxLengthLine).width > rectWidth) {
+      fontSizeDecreaseMultiplier -= 0.1;
+      ctx.font = `${fontSize * fontSizeDecreaseMultiplier}em '${font}'`;
+    }
+
+    for (let i = 0; i < textLines.length; i++) {
+      renderCallback(textLines[i], i);
+    }
+  }
 }
 
 function loadImage(src) {

app/assets/javascripts/discourse/app/static/wizard/components/fields/styling-preview/index.js

@@ -7,8 +7,8 @@ import HomepagePreview from "./-homepage-preview";
 import PreviewBaseComponent from "./-preview-base";
 
 export default class Index extends PreviewBaseComponent {
-  width = 628;
-  height = 322;
+  width = 630;
+  height = 380;
   logo = null;
   avatar = null;
   previewTopic = true;
@@ -111,51 +111,60 @@ export default class Index extends PreviewBaseComponent {
   }
 
   paint({ ctx, colors, font, headingFont, width, height }) {
-    const headerHeight = height * 0.3;
-
     this.drawFullHeader(colors, headingFont, this.logo);
 
     const margin = 20;
-    const avatarSize = height * 0.15;
+    const avatarSize = height * 0.1 + 5;
     const lineHeight = height / 14;
+    const leftHandTextGutter = margin + avatarSize + margin;
+    const timelineX = width * 0.86;
 
     // Draw a fake topic
     this.scaleImage(
       this.avatar,
       margin,
-      headerHeight + height * 0.09,
+      this.headerHeight + height * 0.22,
       avatarSize,
       avatarSize
     );
 
-    const titleFontSize = headerHeight / 55;
+    const titleFontSize = this.headerHeight / 30;
 
+    // Topic title
     ctx.beginPath();
     ctx.fillStyle = colors.primary;
     ctx.font = `bold ${titleFontSize}em '${headingFont}'`;
     ctx.fillText(i18n("wizard.previews.topic_title"), margin, height * 0.3);
 
-    const bodyFontSize = height / 330.0;
+    // Topic OP text
+    const bodyFontSize = 1;
     ctx.font = `${bodyFontSize}em '${font}'`;
 
-    let line = 0;
-    const lines = i18n("wizard.homepage_preview.topic_ops.what_books").split(
-      "\n"
+    let verticalLinePos = 0;
+    const topicOp = i18n("wizard.homepage_preview.topic_ops.what_books");
+    const topicOpLines = topicOp.split("\n");
+
+    this.resizeTextLinesToFitRect(
+      topicOpLines,
+      timelineX - leftHandTextGutter,
+      ctx,
+      bodyFontSize,
+      font,
+      (textLine, idx) => {
+        verticalLinePos = height * 0.4 + idx * lineHeight;
+        ctx.fillText(textLine, leftHandTextGutter, verticalLinePos);
+      }
     );
-    for (let i = 0; i < lines.length; i++) {
-      line = height * 0.4 + i * lineHeight;
-      ctx.fillText(lines[i], margin + avatarSize + margin, line);
-    }
 
     ctx.font = `${bodyFontSize}em '${font}'`;
 
-    // Share Button
+    // Share button
     const shareButtonWidth =
       Math.round(ctx.measureText(i18n("wizard.previews.share_button")).width) +
-      20;
+      margin;
 
     ctx.beginPath();
-    ctx.rect(margin, line + lineHeight, shareButtonWidth, height * 0.1);
+    ctx.rect(margin, verticalLinePos, shareButtonWidth, height * 0.1);
     // accounts for hard-set color variables in solarized themes
     ctx.fillStyle =
       colors.primary_low ||
@@ -165,18 +174,18 @@ export default class Index extends PreviewBaseComponent {
     ctx.fillText(
       i18n("wizard.previews.share_button"),
       margin + 10,
-      line + lineHeight * 1.9
+      verticalLinePos + lineHeight * 0.9
     );
 
-    // Reply Button
+    // Reply button
     const replyButtonWidth =
       Math.round(ctx.measureText(i18n("wizard.previews.reply_button")).width) +
-      20;
+      margin;
 
     ctx.beginPath();
     ctx.rect(
       shareButtonWidth + margin + 10,
-      line + lineHeight,
+      verticalLinePos,
       replyButtonWidth,
       height * 0.1
     );
@@ -185,12 +194,11 @@ export default class Index extends PreviewBaseComponent {
     ctx.fillStyle = colors.secondary;
     ctx.fillText(
       i18n("wizard.previews.reply_button"),
-      shareButtonWidth + margin + 20,
-      line + lineHeight * 1.9
+      shareButtonWidth + margin * 2,
+      verticalLinePos + lineHeight * 0.9
     );
 
-    // Draw Timeline
-    const timelineX = width * 0.86;
+    // Draw timeline
     ctx.beginPath();
     ctx.strokeStyle = colors.tertiary;
     ctx.lineWidth = 0.5;
@@ -198,17 +206,29 @@ export default class Index extends PreviewBaseComponent {
     ctx.lineTo(timelineX, height * 0.7);
     ctx.stroke();
 
-    // Timeline
+    // Timeline handle
     ctx.beginPath();
     ctx.strokeStyle = colors.tertiary;
-    ctx.lineWidth = 2;
-    ctx.moveTo(timelineX, height * 0.3);
+    ctx.lineWidth = 3;
+    ctx.moveTo(timelineX, height * 0.3 + 10);
     ctx.lineTo(timelineX, height * 0.4);
     ctx.stroke();
 
+    // Timeline post count
+    const postCountY = height * 0.3 + margin + 10;
     ctx.font = `Bold ${bodyFontSize}em ${font}`;
     ctx.fillStyle = colors.primary;
-    ctx.fillText("1 / 20", timelineX + margin, height * 0.3 + margin * 1.5);
+    ctx.fillText("1 / 20", timelineX + margin / 2, postCountY);
+
+    // Timeline post date
+    ctx.beginPath();
+    ctx.font = `${bodyFontSize * 0.9}em ${font}`;
+    ctx.fillStyle = darkLightDiff(colors.primary, colors.secondary, 70, 65);
+    ctx.fillText(
+      "Nov 22",
+      timelineX + margin / 2,
+      postCountY + lineHeight * 0.75
+    );
   }
 
   @action

app/assets/stylesheets/wizard.scss

@@ -151,6 +151,12 @@ body.wizard {
     }
   }
 
+  &__step.styling .wizard-container__field.styling-preview-field {
+    label {
+      display: none;
+    }
+  }
+
   &__field {
     margin-bottom: 1em;
   }