clipping-draw-order.cpp
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/*
* Copyright (c) 2020 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <dali-toolkit/dali-toolkit.h>
#include <dali-toolkit/devel-api/controls/table-view/table-view.h>
using namespace Dali;
using namespace Dali::Toolkit;
const char* images[] = {
DEMO_IMAGE_DIR "gallery-small-1.jpg",
DEMO_IMAGE_DIR "gallery-small-2.jpg",
DEMO_IMAGE_DIR "gallery-small-3.jpg",
DEMO_IMAGE_DIR "gallery-small-4.jpg",
DEMO_IMAGE_DIR "gallery-small-5.jpg"};
// This verification example confirms drawing order is the same, with or without clipping enabled.
class ClippingDrawOrderVerification : public ConnectionTracker
{
public:
ClippingDrawOrderVerification(Application& application)
: mApplication(application)
{
// Connect to the Application's Init signal.
mApplication.InitSignal().Connect(this, &ClippingDrawOrderVerification::Create);
}
~ClippingDrawOrderVerification()
{
// Nothing to do here.
}
// The Init signal is received once (only) during the Application lifetime.
void Create(Application& application)
{
// Get a handle to the window
Window window = application.GetWindow();
window.SetBackgroundColor(Color::WHITE);
// Connect to the window's key signal to allow Back and Escape to exit.
window.KeyEventSignal().Connect(this, &ClippingDrawOrderVerification::OnKeyEvent);
// Create the title label.
TextLabel title = TextLabel::New("Clipping draw order verification");
title.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
title.SetProperty(TextLabel::Property::VERTICAL_ALIGNMENT, "CENTER");
title.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
title.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
// Create the description label.
TextLabel description = TextLabel::New("The bottom tree should have the same draw order as the top tree.\nThey should look identical except \"C\" is clipped on the bottom tree.");
description.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
description.SetProperty(TextLabel::Property::MULTI_LINE, true);
description.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER);
description.SetProperty(Actor::Property::PARENT_ORIGIN, Vector3(0.5f, 1.0f, 0.5f));
window.Add(description);
/*
* Create a 4-row TableView.
* It will be segmented as follows:
*
* +---------------+
* | Title |
* +---------------+
* | Tree |
* | Without |
* | Clipping |
* +---------------+
* | Tree |
* | With |
* | Clipping |
* +---------------+
* | Explanation |
* +---------------+
*/
TableView view = TableView::New(4, 1);
view.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::CENTER);
view.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::CENTER);
view.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
view.SetCellAlignment(Toolkit::TableView::CellPosition(0, 0), HorizontalAlignment::CENTER, VerticalAlignment::CENTER);
view.SetCellAlignment(Toolkit::TableView::CellPosition(1, 0), HorizontalAlignment::CENTER, VerticalAlignment::CENTER);
view.SetCellAlignment(Toolkit::TableView::CellPosition(2, 0), HorizontalAlignment::CENTER, VerticalAlignment::CENTER);
view.SetCellAlignment(Toolkit::TableView::CellPosition(3, 0), HorizontalAlignment::CENTER, VerticalAlignment::CENTER);
view.SetCellPadding(Vector2(14.0f, 7.0f));
view.SetRelativeWidth(0u, 1.0f);
view.SetFitHeight(0u);
view.SetRelativeHeight(1u, 0.5f);
view.SetRelativeHeight(2u, 0.5f);
view.SetFitHeight(3u);
// Add the title and description to the TableView.
view.AddChild(title, TableView::CellPosition(0u, 0u));
view.AddChild(description, TableView::CellPosition(3u, 0u));
/*
For each of the 2 tree views, we create a small tree of actors as follows:
( Note: Clipping is only enabled for B on the bottom tree ).
A
/ \
Clipping enabled -> B D
| |
C E
The correct draw order is "ABCDE" (the same as if clipping was not enabled).
*/
const float treeYStart = 0.12f;
const float depthGap = 0.35f;
for(int tree = 0; tree < 2; ++tree)
{
Control container = Control::New();
container.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
container.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::TOP_CENTER);
container.SetResizePolicy(ResizePolicy::FILL_TO_PARENT, Dimension::ALL_DIMENSIONS);
Vector4 backgroundColor = tree == 0 ? Vector4(0.77f, 1.0f, 0.77f, 1.0f) : Vector4(0.8f, 0.8f, 1.0f, 1.0f);
container.SetProperty(Control::Property::BACKGROUND, backgroundColor);
ImageView image[5];
// Loop for each of the 5 images & labels.
for(int i = 0; i < 5; ++i)
{
std::stringstream labelStream;
labelStream << static_cast<char>(static_cast<char>(i) + 'A');
TextLabel textLabel = TextLabel::New(labelStream.str());
textLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
image[i] = ImageView::New(images[i]);
image[i].SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::TOP_CENTER);
// Calculate the relative positioning for the images and labels.
float depth = static_cast<float>(i == 0 ? 0 : ((i - 1) % 2) + 1);
if(i == 0)
{
image[i].SetProperty(Actor::Property::PARENT_ORIGIN, Vector3(0.5f, treeYStart, 0.5f));
textLabel.SetProperty(Actor::Property::PARENT_ORIGIN, Vector3(1.0f, 0.05f * depth, 0.5f));
}
else
{
float b = i > 2 ? 1.0f : -1.0f;
image[i].SetProperty(Actor::Property::PARENT_ORIGIN, Vector3(0.5f + (0.2f * b), depthGap, 0.5f));
textLabel.SetProperty(Actor::Property::PARENT_ORIGIN, Vector3(0.98f + 0.215f * b + (0.04f * b * depth), treeYStart + 0.02f + (0.16f * depth), 0.5f));
}
container.Add(textLabel);
}
// Create the title label.
std::string treeText = tree == 0 ? "Without Clipping" : "With Clipping";
TextLabel treeLabel = TextLabel::New(treeText);
treeLabel.SetProperty(TextLabel::Property::HORIZONTAL_ALIGNMENT, "CENTER");
treeLabel.SetProperty(TextLabel::Property::VERTICAL_ALIGNMENT, "BOTTOM");
treeLabel.SetProperty(Actor::Property::ANCHOR_POINT, AnchorPoint::BOTTOM_CENTER);
treeLabel.SetProperty(Actor::Property::PARENT_ORIGIN, ParentOrigin::BOTTOM_CENTER);
container.Add(treeLabel);
// Enable clipping for the 2nd tree.
if(tree == 1)
{
image[1].SetProperty(Actor::Property::CLIPPING_MODE, ClippingMode::CLIP_CHILDREN);
}
// Build the tree structure.
container.Add(image[0]);
image[0].Add(image[1]);
image[1].Add(image[2]);
image[0].Add(image[3]);
image[3].Add(image[4]);
// Add the finished tree to the TableView.
view.AddChild(container, TableView::CellPosition(1u + tree, 0u));
}
// Add the finished TableView to the window.
window.Add(view);
// Respond to a click anywhere on the window
window.GetRootLayer().TouchedSignal().Connect(this, &ClippingDrawOrderVerification::OnTouch);
}
bool OnTouch(Actor actor, const TouchEvent& touch)
{
// Quit the application.
mApplication.Quit();
return true;
}
/**
* @brief Called when any key event is received
*
* Will use this to quit the application if Back or the Escape key is received
* @param[in] event The key event information
*/
void OnKeyEvent(const KeyEvent& event)
{
if(event.GetState() == KeyEvent::DOWN)
{
if(IsKey(event, DALI_KEY_ESCAPE) || IsKey(event, DALI_KEY_BACK))
{
mApplication.Quit();
}
}
}
private:
Application& mApplication;
};
int DALI_EXPORT_API main(int argc, char** argv)
{
Application application = Application::New(&argc, &argv);
ClippingDrawOrderVerification verification(application);
application.MainLoop();
return 0;
}