1731c0fb42
This shim does the following: 1. Intercept window.print() 2. For a window.print() call (if allowed, ie. no previous print job): 1. Dispatch the beforeprint event. 2. Render a printg progress dialog. 3. For each canvas, call mozPrintCallback if existent (one at a time, async). 4. During each mozPrintCallback callback, update the progress dialog. 5. When all <canvas>es have been rendered, invoke the real window.print(). 6. Dispatch the afterprint event. The shim is not included in Firefox through the preprocessor. Keyboard shortcuts (Ctrl/Cmd + P) are intercepted and default behavior (i.e. printing) is prevented, and the steps for window.print() are run. window.attachEvent is used, in order to cancel printing in IE10 and earlier (courtesy of Stack Overflow - http://stackoverflow.com/a/15302847). Unfortunately, this doesn't work in IE11 - if Ctrl + P is used, the print dialog will be shown twice: Once because of Ctrl + P, and again when all pages have finished rendering. This logic of this polyfill is not specific to PDF.js, so it can also be used in other projects. There's one additional modification in PDF.js's viewer.js: The printed <canvas> element is wrapped in a <div>. This is needed, because Chrome would otherwise print one canvas on two pages.
72 lines
1.4 KiB
HTML
72 lines
1.4 KiB
HTML
<div id="mozPrintCallback-shim" hidden>
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<style scoped>
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#mozPrintCallback-shim {
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position: fixed;
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top: 0;
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left: 0;
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height: 100%;
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width: 100%;
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z-index: 9999999;
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display: block;
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text-align: center;
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background-color: rgba(0, 0, 0, 0.5);
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}
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#mozPrintCallback-shim[hidden] {
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display: none;
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}
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@media print {
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#mozPrintCallback-shim {
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display: none;
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}
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}
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#mozPrintCallback-shim .mozPrintCallback-dialog-box {
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display: inline-block;
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margin: -50px auto 0;
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position: relative;
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top: 45%;
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left: 0;
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min-width: 220px;
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max-width: 400px;
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padding: 9px;
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border: 1px solid hsla(0, 0%, 0%, .5);
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border-radius: 2px;
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box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
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background-color: #474747;
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color: hsl(0, 0%, 85%);
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font-size: 16px;
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line-height: 20px;
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}
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#mozPrintCallback-shim .progress-row {
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clear: both;
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padding: 1em 0;
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}
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#mozPrintCallback-shim progress {
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width: 100%;
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}
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#mozPrintCallback-shim .relative-progress {
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clear: both;
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float: right;
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}
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#mozPrintCallback-shim .progress-actions {
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clear: both;
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}
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</style>
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<div class="mozPrintCallback-dialog-box">
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<!-- TODO: Localise the following strings -->
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Preparing document for printing...
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<div class="progress-row">
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<progress value="0" max="100"></progress>
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<span class="relative-progress">0%</span>
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</div>
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<div class="progress-actions">
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<input type="button" value="Cancel" class="mozPrintCallback-cancel">
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</div>
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</div>
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</div>
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