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<title>[37596] trunk/src/wp-admin: Editor: better resizing for text editor</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/37596">37596</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/37596","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>iseulde</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-05-30 20:31:57 +0000 (Mon, 30 May 2016)</dd>
</dl>

<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Editor: better resizing for text editor

* Use `scrollHeight` to resize the text editor.
* Don't scroll the cursor into view when under the text editor's toolbar, it
  involves cloning the content which is quite slow.

Props iseulde, azaozz.

See <a href="https://core.trac.wordpress.org/ticket/36482">#36482</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadmincsseditcss">trunk/src/wp-admin/css/edit.css</a></li>
<li><a href="#trunksrcwpadminjseditorexpandjs">trunk/src/wp-admin/js/editor-expand.js</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpadmincsseditcss"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/css/edit.css</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/css/edit.css   2016-05-30 04:37:57 UTC (rev 37595)
+++ trunk/src/wp-admin/css/edit.css     2016-05-30 20:31:57 UTC (rev 37596)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -377,16 +377,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">        position: relative;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-#content-textarea-clone {
-       z-index: -1;
-       position: absolute;
-       top: 0;
-       visibility: hidden;
-       overflow: hidden;
-       max-width: 100%;
-       border: 1px solid transparent;
-}
-
</del><span class="cx" style="display: block; padding: 0 10px"> .wp-editor-expand #wp-content-editor-tools {
</span><span class="cx" style="display: block; padding: 0 10px">        z-index: 1000;
</span><span class="cx" style="display: block; padding: 0 10px">        border-bottom: 1px solid #e5e5e5;
</span></span></pre></div>
<a id="trunksrcwpadminjseditorexpandjs"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/js/editor-expand.js</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/js/editor-expand.js    2016-05-30 04:37:57 UTC (rev 37595)
+++ trunk/src/wp-admin/js/editor-expand.js      2016-05-30 20:31:57 UTC (rev 37596)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -15,7 +15,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $visualEditor = $(),
</span><span class="cx" style="display: block; padding: 0 10px">                        $textTop = $( '#ed_toolbar' ),
</span><span class="cx" style="display: block; padding: 0 10px">                        $textEditor = $( '#content' ),
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $textEditorClone = $( '<div id="content-textarea-clone" class="wp-exclude-emoji"></div>' ),
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 textEditor = $textEditor[0],
+                       textEditorLength = 0,
</ins><span class="cx" style="display: block; padding: 0 10px">                         $bottom = $( '#post-status-info' ),
</span><span class="cx" style="display: block; padding: 0 10px">                        $menuBar = $(),
</span><span class="cx" style="display: block; padding: 0 10px">                        $statusBar = $(),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -52,16 +53,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                sideSortablesHeight: 0
</span><span class="cx" style="display: block; padding: 0 10px">                        };
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $textEditorClone.insertAfter( $textEditor );
-
-               $textEditorClone.css( {
-                       'font-family': $textEditor.css( 'font-family' ),
-                       'font-size': $textEditor.css( 'font-size' ),
-                       'line-height': $textEditor.css( 'line-height' ),
-                       'white-space': 'pre-wrap',
-                       'word-wrap': 'break-word'
-               } );
-
</del><span class="cx" style="display: block; padding: 0 10px">                 function getHeights() {
</span><span class="cx" style="display: block; padding: 0 10px">                        var windowWidth = $window.width();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -84,70 +75,30 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                function textEditorKeyup( event ) {
-                       var VK = jQuery.ui.keyCode,
-                               key = event.keyCode,
-                               range = document.createRange(),
-                               selStart = $textEditor[0].selectionStart,
-                               selEnd = $textEditor[0].selectionEnd,
-                               textNode = $textEditorClone[0].firstChild,
-                               buffer = 10,
-                               offset, cursorTop, cursorBottom, editorTop, editorBottom;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         function textEditorResize() {
+                       var reduce, scrollHeight;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( selStart && selEnd && selStart !== selEnd ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( mceEditor && ! mceEditor.isHidden() ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 return;
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        // These are not TinyMCE ranges.
-                       try {
-                               range.setStart( textNode, selStart );
-                               range.setEnd( textNode, selEnd + 1 );
-                       } catch ( ex ) {}
-
-                       offset = range.getBoundingClientRect();
-
-                       if ( ! offset.height ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( ! mceEditor && initialMode === 'tinymce' ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                 return;
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        cursorTop = offset.top - buffer;
-                       cursorBottom = cursorTop + offset.height + buffer;
-                       editorTop = heights.adminBarHeight + heights.toolsHeight + heights.textTopHeight;
-                       editorBottom = heights.windowHeight - heights.bottomHeight;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 reduce = textEditorLength > ( textEditorLength = textEditor.value.length );
+                       scrollHeight = textEditor.scrollHeight;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( cursorTop < editorTop && ( key === VK.UP || key === VK.LEFT || key === VK.BACKSPACE ) ) {
-                               window.scrollTo( window.pageXOffset, cursorTop + window.pageYOffset - editorTop );
-                       } else if ( cursorBottom > editorBottom ) {
-                               window.scrollTo( window.pageXOffset, cursorBottom + window.pageYOffset - editorBottom );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( reduce ) {
+                               textEditor.style.height = 'auto';
+                               textEditor.style.height = scrollHeight + 'px';
+                               adjust();
+                       } else if ( parseInt( textEditor.style.height, 10 ) < scrollHeight ) {
+                               textEditor.style.height = scrollHeight + 'px';
+                               adjust();
</ins><span class="cx" style="display: block; padding: 0 10px">                         }
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                function textEditorResize() {
-                       if ( ( mceEditor && ! mceEditor.isHidden() ) || ( ! mceEditor && initialMode === 'tinymce' ) ) {
-                               return;
-                       }
-
-                       var textEditorHeight = $textEditor.height(),
-                               hiddenHeight;
-
-                       $textEditorClone.width( $textEditor.width() - 22 );
-                       $textEditorClone.text( $textEditor.val() + '&nbsp;' );
-
-                       hiddenHeight = $textEditorClone.height();
-
-                       if ( hiddenHeight < autoresizeMinHeight ) {
-                               hiddenHeight = autoresizeMinHeight;
-                       }
-
-                       if ( hiddenHeight === textEditorHeight ) {
-                               return;
-                       }
-
-                       $textEditor.height( hiddenHeight );
-
-                       adjust();
-               }
-
</del><span class="cx" style="display: block; padding: 0 10px">                 // We need to wait for TinyMCE to initialize.
</span><span class="cx" style="display: block; padding: 0 10px">                $document.on( 'tinymce-editor-init.editor-expand', function( event, editor ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        var VK = window.tinymce.util.VK,
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -474,7 +425,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                        if ( event && event.deltaHeight > 0 && event.deltaHeight < 100 ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                                window.scrollBy( 0, event.deltaHeight );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                        } else if ( advanced ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                 } else if ( visual && advanced ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                                                 fixedBottom = true;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                                                $statusBar.css( {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -603,8 +554,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                        $textEditor.css( {
</span><span class="cx" style="display: block; padding: 0 10px">                                                marginTop: heights.textTopHeight
</span><span class="cx" style="display: block; padding: 0 10px">                                        } );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-
-                                       $textEditorClone.width( contentWrapWidth - 20 - ( borderWidth * 2 ) );
</del><span class="cx" style="display: block; padding: 0 10px">                                 }
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -660,7 +609,6 @@
</span><span class="cx" style="display: block; padding: 0 10px">                                });
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        $textEditor.on( 'focus.editor-expand input.editor-expand propertychange.editor-expand', textEditorResize );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $textEditor.on( 'keyup.editor-expand', textEditorKeyup );
</del><span class="cx" style="display: block; padding: 0 10px">                         mceBind();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Adjust when entering/exiting fullscreen mode.
</span></span></pre>
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