1 files changed, 152 insertions, 0 deletions
diff --git a/wiki/lib/scripts/textselection.js b/wiki/lib/scripts/textselection.js
new file mode 100644
index 0000000..16874ba
--- /dev/null
+++ b/wiki/lib/scripts/textselection.js
@@ -0,0 +1,152 @@
+/**
+ * Text selection related functions.
+ */
+
+/**
+ * selection prototype
+ *
+ * Object that capsulates the selection in a textarea. Returned by DWgetSelection.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function selection_class(){
+    this.start     = 0;
+    this.end       = 0;
+    this.obj       = null;
+    this.scroll    = 0;
+    this.fix       = 0;
+
+    this.getLength = function(){
+        return this.end - this.start;
+    };
+
+    this.getText = function(){
+        return (!this.obj) ? '' : this.obj.value.substring(this.start,this.end);
+    };
+}
+
+/**
+ * Get current selection/cursor position in a given textArea
+ *
+ * @link   http://groups.drupal.org/node/1210
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @link   http://linebyline.blogspot.com/2006/11/textarea-cursor-position-in-internet.html
+ * @returns object - a selection object
+ */
+function DWgetSelection(textArea) {
+    var sel = new selection_class();
+
+    textArea.focus();
+    sel.obj   = textArea;
+    sel.start  = textArea.selectionStart;
+    sel.end    = textArea.selectionEnd;
+    sel.scroll = textArea.scrollTop;
+    return sel;
+}
+
+/**
+ * Set the selection
+ *
+ * You need to get a selection object via DWgetSelection() first, then modify the
+ * start and end properties and pass it back to this function.
+ *
+ * @link http://groups.drupal.org/node/1210
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @param {selection_class} selection  a selection object as returned by DWgetSelection()
+ */
+function DWsetSelection(selection){
+    selection.obj.setSelectionRange(selection.start, selection.end);
+    if(selection.scroll) selection.obj.scrollTop = selection.scroll;
+}
+
+/**
+ * Inserts the given text at the current cursor position or replaces the current
+ * selection
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ * @param {string}  text           the new text to be pasted
+ * @param {selection_class}  selection     selection object returned by DWgetSelection
+ * @param {int}     opts.startofs  number of charcters at the start to skip from new selection
+ * @param {int}     opts.endofs    number of characters at the end to skip from new selection
+ * @param {boolean} opts.nosel     set true if new text should not be selected
+ */
+function pasteText(selection,text,opts){
+    if(!opts) opts = {};
+    // replace the content
+
+    selection.obj.value =
+        selection.obj.value.substring(0, selection.start) + text +
+        selection.obj.value.substring(selection.end, selection.obj.value.length);
+
+    // set new selection
+    if (is_opera) {
+        // Opera replaces \n by \r\n when inserting text.
+        selection.end = selection.start + text.replace(/\r?\n/g, '\r\n').length;
+    } else {
+        selection.end = selection.start + text.length;
+    }
+
+
+    // modify the new selection if wanted
+    if(opts.startofs) selection.start += opts.startofs;
+    if(opts.endofs)   selection.end   -= opts.endofs;
+
+    // no selection wanted? set cursor to end position
+    if(opts.nosel) selection.start = selection.end;
+
+    DWsetSelection(selection);
+}
+
+
+/**
+ * Format selection
+ *
+ * Apply tagOpen/tagClose to selection in textarea, use sampleText instead
+ * of selection if there is none.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function insertTags(textAreaID, tagOpen, tagClose, sampleText){
+    var txtarea = jQuery('#' + textAreaID)[0];
+
+    var selection = DWgetSelection(txtarea);
+    var text = selection.getText();
+    var opts;
+
+    // don't include trailing space in selection
+    if(text.charAt(text.length - 1) == ' '){
+        selection.end--;
+        text = selection.getText();
+    }
+
+    if(!text){
+        // nothing selected, use the sample text and select it
+        text = sampleText;
+        opts = {
+            startofs: tagOpen.length,
+            endofs: tagClose.length
+        };
+    }else{
+        // place cursor at the end
+        opts = {
+            nosel: true
+        };
+    }
+
+    // surround with tags
+    text = tagOpen + text + tagClose;
+
+    // do it
+    pasteText(selection,text,opts);
+}
+
+/**
+ * Wraps around pasteText() for backward compatibility
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+function insertAtCarret(textAreaID, text){
+    var txtarea = jQuery('#' + textAreaID)[0];
+    var selection = DWgetSelection(txtarea);
+    pasteText(selection,text,{nosel: true});
+}