DropDownList items on the Style.xml


#1

Hello,

I’ve been exploring the UI Elements, and while most of it pretty straight forward, I’m having some trouble trying to set the style of the DropDownList items in the DefaultStyle.xml file.

I tried setting the Text attributes of the items this way, but it didn’t work:

<element type="DropDownList" style="BorderImage">
	<attribute name="Image Rect" value="16 0 32 16" />
	<attribute name="Border" value="4 4 4 4" />
	<attribute name="Pressed Image Offset" value="16 0" />
	<attribute name="Hover Image Offset" value="0 16" />
	<attribute name="Pressed Child Offset" value="-1 1" />
	<attribute name="Layout Mode" value="Horizontal" />
	<attribute name="Layout Border" value="4 1 4 1" />
	<element internal="true">
		<!-- Default:
		<element type="Text" internal="true" />
		-->
		<!-- First attempt to set the style to the DropDownList items: -->
		<element type="Text" internal="true">
			<attribute name="Color" value="1 0 0 1" /> <!-- Set the text red -->
		</element>
	</element>
	<element type="Window" internal="true" popup="true">
		<attribute name="Layout Border" value="2 4 2 4" />
		<element type="ListView" internal="true">
			<attribute name="Highlight Mode" value="Always" />
			<element type="BorderImage" internal="true">    <!-- Override scroll panel attributes from default ListView -->
				<attribute name="Opacity" value="0" />
				<attribute name="Clip Border" value="2 0 2 0" />
			</element>
		</element>
	</element>
</element>

I also tried to setting it this way, but it also didn’t work:

<element type="DropDownList" style="BorderImage">
	<attribute name="Image Rect" value="16 0 32 16" />
	<attribute name="Border" value="4 4 4 4" />
	<attribute name="Pressed Image Offset" value="16 0" />
	<attribute name="Hover Image Offset" value="0 16" />
	<attribute name="Pressed Child Offset" value="-1 1" />
	<attribute name="Layout Mode" value="Horizontal" />
	<attribute name="Layout Border" value="4 1 4 1" />
	<!-- Default:
	<element internal="true">
		<element type="Text" internal="true" />
	</element>
	-->
	<!-- Second attempt to set the style to the DropDownList items: -->
	<element type="Text" internal="true">
		<attribute name="Color" value="1 0 0 1" /> <!-- Set the text red -->
	</element>
	<element type="Window" internal="true" popup="true">
		<attribute name="Layout Border" value="2 4 2 4" />
		<element type="ListView" internal="true">
			<attribute name="Highlight Mode" value="Always" />
			<element type="BorderImage" internal="true">    <!-- Override scroll panel attributes from default ListView -->
				<attribute name="Opacity" value="0" />
				<attribute name="Clip Border" value="2 0 2 0" />
			</element>
		</element>
	</element>
</element>

image

And I’m using this small test.cpp file:

#include <Urho3D/Core/Object.h>
#include <Urho3D/Core/Context.h>
#include <Urho3D/Core/CoreEvents.h>
#include <Urho3D/Core/ProcessUtils.h>
#include <Urho3D/Engine/Application.h>
#include <Urho3D/Engine/Engine.h>
#include <Urho3D/Input/Input.h>
#include <Urho3D/Resource/ResourceCache.h>

#include <Urho3D/UI/DropDownList.h>
#include <Urho3D/UI/Font.h>
#include <Urho3D/UI/Text.h>
#include <Urho3D/UI/UI.h>
#include <Urho3D/UI/UIEvents.h>

using namespace Urho3D;

class Game : public Application {

	public:

		Game(Context *context) : Application(context) {

		}

		void Setup() {

			engineParameters_["FullScreen"]=false;
			engineParameters_["WindowWidth"]=320;
			engineParameters_["WindowHeight"]=240;

		}

		void Start() {

			UIElement *uiRoot_ = GetSubsystem<UI>()->GetRoot();
			uiRoot_->SetDefaultStyle(GetSubsystem<ResourceCache>()->GetResource<XMLFile>("UI/DefaultStyle.xml"));

			GetSubsystem<Input>()->SetMouseVisible(true);

			// Create a dropdownContainer UIElement:
			UIElement *dropdownContainer_ = new UIElement(context_);
			dropdownContainer_->SetLayoutMode(LM_HORIZONTAL);
			uiRoot_->AddChild(dropdownContainer_);

			// Create a dropdownTile Text:
			Text *dropdownTitle_ = new Text(context_);
			dropdownContainer_->AddChild(dropdownTitle_);
			dropdownTitle_->SetText("dropdownTitle");
			dropdownTitle_->SetStyleAuto();

			// Create the dropdown list:
			DropDownList *dropdownList_ = new DropDownList(context_);
			dropdownContainer_->AddChild(dropdownList_);
			dropdownList_->SetStyleAuto();
			dropdownList_->SetMinWidth(100);
			dropdownList_->SetSelection(0);

			// Create a list of the dropdown items:
			const char *dropdownItems[] = { "Item 1", "Item 2",	NULL };
			for (int i = 0; dropdownItems[i]; ++i) {
				Text *dropdownItem_ = new Text(context_);
				dropdownList_->AddItem(dropdownItem_);
				dropdownItem_->SetText(dropdownItems[i]);
				dropdownItem_->SetStyleAuto();
				dropdownItem_->SetMinWidth(100);
			}

		}

}; URHO3D_DEFINE_APPLICATION_MAIN(Game);

I know I can apply the changes directly on the code (e.g.: dropdownItem_->SetColor(Color(1,0,0,1));), but I was trying to keep all styles on the XML file so I can more easily swap then as needed.

I also checked the Editor XML files, but, although there are some DropDownList definitions there, I couldn’t find one that customized the item elements.

Does anyone have any idea of what am I missing there?

Best regards.


#2

What you’re doing in that first case is setting the placeholder text, which AFAIK is almost never actually used. If you open the editor and create a new DropDownList via the GUI it’ll be one of the few cases where you’ll actually see that element and your first style should work there (have to open DDL_Placeholder_xxxx_gobbly_gook_xxx and set the text, show internal UI).

I have no idea how you get to the one you want though.


#3

@Sinoid, oh, I see. Thank you very much for clarifying that.

I tried placing the a Text element inside the BorderImage, but unfortunately the attribute only applies to that specific element:

<element type="DropDownList" style="BorderImage">
	<attribute name="Image Rect" value="16 0 32 16" />
	<attribute name="Border" value="4 4 4 4" />
	<attribute name="Pressed Image Offset" value="16 0" />
	<attribute name="Hover Image Offset" value="0 16" />
	<attribute name="Pressed Child Offset" value="-1 1" />
	<attribute name="Layout Mode" value="Horizontal" />
	<attribute name="Layout Border" value="4 1 4 1" />
	<element internal="true">
		<element type="Text" internal="true" />
	</element>
	<element type="Window" internal="true" popup="true">
		<attribute name="Layout Border" value="2 4 2 4" />
		<element type="ListView" internal="true">
			<attribute name="Highlight Mode" value="Always" />
			<element type="BorderImage" internal="true">    <!-- Override scroll panel attributes from default ListView -->
				<attribute name="Opacity" value="0" />
				<attribute name="Clip Border" value="2 0 2 0" />
				<!-- Third attempt to set the style to the DropDownList items: -->
				<element internal="true">
					<element type="Text">
						<attribute name="Text" value="Value" />
						<attribute name="Color" value="1 0 0 1" />
					</element>
				</element>
			</element>
		</element>
	</element>
</element>

image

Almost there. :laughing: