How to Adjust the Padding of Tree Row in GWT?

Have you ever seen a GWT tree before? It sort of resembles the following structure:

<div class="gwt-Tree">
    <div style="padding-top: 3px; padding-right: 3px;
                padding-bottom: 3px; margin-left: 0px;
                padding-left: 23px;">
         <div style="display:inline;" class="gwt-TreeItem">
              <table>
                   ...
              </table>
         </div>
    </div>
    <div ...>
    </div>
    ...
</div>

I'm curious about adjusting the padding for each tree row individually. Would it be acceptable to set CSS properties for .gwt-Tree > div or is there a more refined approach?

Solution: As far as we have discovered, there doesn't seem to be a more graceful method. This is what worked for us:

 .gwt-Tree > div:first-child { 
      width: 0px !important; 
      height: 0px !important; 
      margin: 0px !important; 
      padding: 0px !important; 
 } 

 .gwt-Tree > div {
      padding: 0px 5px !important;
 }

 .gwt-Tree > div[hidefocus=true] {
      width: 0px !important;
      height: 0px !important;

      margin: 0px !important;
      padding: 0px !important;
 }
javacssgwttree

Answer №1

Encountering the same issue, I attempted to tackle it using CSS without success. Eventually, I found a solution by adjusting the top and bottom padding within the Java code:

/**
    * handle top and bottom padding issue of leafs the grandparent DOM element (div) has disturbing top and bottom
    * padding of 3px, which is changed here to 0px
    * 
    * @param uiObject
    *           uiObject which is a leaf in the tree
    */
   private static void correctStyle(final UIObject uiObject) {
      if (uiObject instanceof TreeItem) {
         if (uiObject != null && uiObject.getElement() != null) {
            Element element = uiObject.getElement();
            element.getStyle().setPaddingBottom(0, Unit.PX);
            element.getStyle().setPaddingTop(0, Unit.PX);
         }
      } else {
         if (uiObject != null && uiObject.getElement() != null && uiObject.getElement().getParentElement() != null
               && uiObject.getElement().getParentElement().getParentElement() != null
               && uiObject.getElement().getParentElement().getParentElement().getStyle() != null) {
            Element element = uiObject.getElement().getParentElement().getParentElement();
            element.getStyle().setPaddingBottom(0, Unit.PX);
            element.getStyle().setPaddingTop(0, Unit.PX);
         }
      }
   }

The method is implemented in the following manner within the code snippet:

Anchor fileDownloadLink = new Anchor();
fileDownloadLink.setStyleName(ViewConstants.STYLE_LINK_FILE_DOWNLOAD);
fileDownloadLink.setText(subSubStructure.getName());
fileDownloadLink.setHref(ViewConstants.HREF_DOWNLOAD_FILE_EXTRACTED_DATA + subSubStructure.getPath());
treeItem.addItem(fileDownloadLink);
StyleCorrector.correctStyle(fileDownloadLink);

Answer №2

If you want to achieve this, here's one way to do it:

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Test</title>
    <style type="text/css">
    .gwt-Tree {background:green;}
    .gwt-Tree div {padding-top: 3px; padding-right: 3px;padding-bottom: 3px; margin-left: 0px;padding-left: 23px;background:gray;}
    .gwt-Tree div .gwt-TreeItem {padding:0;margin:0;background:red;color:#fff;}
    </style> 
</head>
<body>
<div class="gwt-Tree">
    <div>
         <div class="gwt-TreeItem">
            random
         </div>
    </div>
    <div>
         <div class="gwt-TreeItem">
            random
         </div>
    </div>
</div> 
</body>
</html>

Please keep in mind that the .gwt-Tree div style will affect all child divs, so remember to reset them with .gwt-Tree div .gwtTreeItem if needed.

Regarding the "hacky >" you mentioned - the > selector is supported in most browsers except for IE6, which may not recognize it.

Answer №3

After reviewing the documentation for GWT's Tree component, I found some important CSS style rules that should be applied to tree and tree items:

CSS Style Rules

.gwt-Tree
- Styles the tree itself

.gwt-Tree .gwt-TreeItem
- Styles a tree item

.gwt-Tree .gwt-TreeItem-selected
- Styles a selected tree item

To improve the appearance, consider adding padding to both .gwt-Tree .gwt-TreeItem and .gwt-Tree .gwt-TreeItem-selected.

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