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POBlackberry -- Updating screen changes drawing order of manager its field elements
 

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  1. POBlackberry -- Updating screen changes drawing order of manager its field elements
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    <p><strong>Scenario</strong><br> In a screen I have 2 managers: 1) menu manager at the top and 2) body manager that has info/button elements. The menu manager does custom drawing so that its menu elements (LabelFields) are properly spaced.</p> <p><strong>Core Issue - Manager and subfield drawing order</strong><br> The screen draws fine except when the user preforms an action (clicks a button) that results in an element withing the body manager being added/removed. Once field elements are added/removed from the body, the order in which the menu is drawn gets mixed up. </p> <p>When the body manager adds or removes a field, <strong><em>instead of the menu manager drawing itself and then its sub elements (label fields), the menu manager begins to draw its sub elements and then itself</em></strong>; thus painting on top of the label fields and making them look like they've disappeared.</p> <p><strong>Comments</strong><br> Already tried invalidate and other options -- I've tried to call invalidate, invalidateall, updateDisplay... after adding/removing field elements from body. All without success.</p> <p>Removing custom sublayout works -- The only way that I can resolve this issue is to remove the menu managers custom sublayout logic. Unfortunately the menu system then draws in a traditional manner and does not provide enough spacing. </p> <p>Below is the sublayout code for the menu manager, am I missing something here?</p> <pre><code>public void sublayout(int iWidth, int iHeight) { final int iNumFields = getFieldCount(); int maxHeight = 0; final int segmentWidth = iWidth / iNumFields; final int segmentWidthHalf = segmentWidth / 2; for (int i = 0; i &lt; iNumFields; i++) { final Item currentField = (Item)this.getField(i); // 1. Use index to compute bounds of the field final int xSegmentTrueCenter = segmentWidth * i + segmentWidthHalf; // 2. center field inbetween bounds using field width (find fill width of text) final int xFieldStart = xSegmentTrueCenter - currentField.getFont().getAdvance(currentField.getText())/2; // set up position setPositionChild(currentField, xFieldStart, getContentTop() + MenuAbstract.PADDING_VERTICAL); // allow child to draw itself layoutChild(currentField, iWidth, currentField.getHeight()); // compute max height of the field //int fieldheight = currentField.getHeight(); maxHeight = currentField.getHeight() &gt; maxHeight ? currentField.getHeight() + 2 * MenuAbstract.PADDING_VERTICAL : maxHeight; } this.setExtent(iWidth, maxHeight); } </code></pre> <p><strong>Final Questions</strong><br> Ultimately I want to keep the custom layout of the menu manager while being allowed to redraw field elements. Here are my final questions:</p> <ol> <li><p>Have you experienced this before?</p></li> <li><p>Why would the menu manager begin drawing in the wrong order when a field element is added/remove to the screen?</p></li> <li><p>Does the native Manager.sublayout() do something that I'm not to maintain drawing order?</p></li> </ol>
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