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add scaling to <iframe>s in the preview list so all content can be seen #37

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merged 4 commits into from
Aug 27, 2021
Merged

add scaling to <iframe>s in the preview list so all content can be seen #37

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4a14aa0
wip of getting some scaling in place
thescientist13 Aug 20, 2021
2db7e55
scale theme statement slide
thescientist13 Aug 26, 2021
7e76cb7
update image
thescientist13 Aug 26, 2021
8c158b0
remove TODO comment
thescientist13 Aug 27, 2021
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Binary file modified .github/images/greenwood-starter-presentation.png
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46 changes: 24 additions & 22 deletions src/components/slide-list.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,6 @@ class SlideList extends LitElement {
};
}

// TODO preserve aspect ratio
static get styles() {
return css`
:host {
Expand All @@ -34,20 +33,11 @@ class SlideList extends LitElement {
z-index: 100;
}

/* iframe {
height: 200px;
width: 10%;
margin-left: 15px;
margin-top: -10px;
transform: scale(1.5);
transform-origin: 0 0;
} */

span.num {
float: left
}

#wrap {
.wrap {
width: 100%;
padding: 0;
filter: drop-shadow(5px 10px 3px gray);
Expand All @@ -56,26 +46,19 @@ class SlideList extends LitElement {
position: relative;
}

#wrap > iframe {
.wrap > iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
zoom: 0.75;
-moz-transform: scale(0.75);
-moz-transform-origin: 0 0;
-o-transform: scale(0.75);
-o-transform-origin: 0 0;
-webkit-transform: scale(0.75);
-webkit-transform-origin: 0 0;
}

@media screen and (-webkit-min-device-pixel-ratio: 0) {
#scaled-frame {
zoom: 1;
}
}
`;
}

Expand All @@ -97,6 +80,19 @@ class SlideList extends LitElement {
document.dispatchEvent(new CustomEvent('slide-selected', { detail: slide }));
}

slideLoaded(slide) {
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The only slight downside with this approach is that it causes the scaling to "snap" into place which may be somewhat noticeable.

But, if we apply this style directly the template, then it will also be scaled down in the main window too... so 🤷‍♂️

const frame = this.shadowRoot.getElementById(`slide_${slide.id}`);
const style = document.createElement('style');

style.textContent = `
body {
zoom: .4;
}
`;

frame.contentDocument.head.appendChild(style);
}

render() {
const { slides } = this;
const list = slides.map((slide, index) => {
Expand All @@ -105,8 +101,14 @@ class SlideList extends LitElement {
return html`
<span class="num">${slideNum})</span>
<div @click="${() => this.slideSelected(slide)}">
<div id="wrap">
<iframe id="scaled-frame" src="${slide.route}" loading="lazy"></iframe>
<div class="wrap">
<iframe
id="slide_${slide.id}"
src="${slide.route}"
class="scaled-frame"
@load="${() => this.slideLoaded(slide) }"
loading="lazy">
</iframe>
</div>
<div class="iframe-screen"></div>
</div>
Expand All @@ -119,4 +121,4 @@ class SlideList extends LitElement {
}
}

customElements.define('slide-list', SlideList);
customElements.define('slide-list', SlideList);
4 changes: 2 additions & 2 deletions src/layouts/theme-statement.html
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Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,8 @@
div#container {
display: flex;
flex-direction: column;
justify-content: flex-end;
height: 90vh;
text-align: left;
height: 95vh;
padding-left: 2rem;
width: 100%;
margin: 0;
Expand Down