Enhancing the Combo-Widget with Images(转载)-白红宇

Enhancing the Combo-Widget with Images(转载)

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发布时间：2019-06-19

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Probably you was already faced with the requirement to add small icons to your pulldowns. That looks very nice, but unfortunately there is no common SWT-Widget to realize this.

Fortunately the Eclipse-Framework is OpenSource and we can reprodruce the structure of a SWT-ComboBox. A Combo is not more than a text-field and a small button with an arrow. In addition is a event-handler implemented that shows a Composite as a tooltip with the entries of the "combo-list". We just have to take this class and change the structure of the content. We don't want to have a org.eclipse.swt.widgets.List, but a org.eclipse.swt.widgets.Table with multiple org.eclipse.swt.widgets.TableItems where you can specify an image. After adjusting the access-methods we have a new cool Widget, that has the same structure and methods like the "built-in"s.

Screenshot

The ImageCombo in Action (as Widget in a JFace-Dialog).

Usage

Reference the Widget like all the other ones.

Update

(Thanks to Jeremy Dowdall)

Code-Example

The following snippet show the usage in a very simple JFace-Dialog.

JAVA:

* Very Simple Dialog with {@link org.eclipse.swt.widgets.Label}

* and a Combo that has the capability to show also icons.

* @author Tom Seidel

public
class SimpleDialog
extends
{

private list;

* @param parentShell

* @param list

protected SimpleDialog
(Shell parentShell, list
)
{

super
(parentShell
);

this.
list = list;

}

/* (non-Javadoc)

* @see org.eclipse.jface.dialogs.Dialog#createDialogArea(org.eclipse.swt.widgets.Composite)

protected createDialogArea
( parent
)
{

comp =
(
) super.
createDialogArea
(parent
);

comp.
setLayout
(
new
(
2,
true
)
);

textLabel =
new
(comp,SWT.
NONE
);

GridData gd =
new GridData
(SWT.
BEGINNING, SWT.
CENTER,
false,
false
);

gd.
widthHint =
80;

textLabel.
setLayoutData
(gd
);

textLabel.
setText
(
"Your choice:"
);
//$NON-NLS-1$

ImageCombo combo =
new ImageCombo
(comp, SWT.
READ_ONLY | SWT.
BORDER
);

iter =
this.
list.
iterator
(
);

while
(iter.
hasNext
(
)
)
{

AbstractBaseElement element =
(AbstractBaseElement
) iter.
next
(
);

// add text and image to the combo.

combo.
add
(element.
getId
(
),ImagecontributionPlugin.
getDefault
(
)

.
getImage
(ImageContributor.
getImageIdByObject
(element
)
)
);

}

combo.
setLayoutData
(gd
);

return comp;

}

}

转载:

http://www.richclient2.de/2006_03_03/enhancing-the-combo-widget-with-images/

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