Development of Layout Container Components

Layout container components consist of basic view classes. You can set the view positions to achieve nested and overlapped layouts, set the layout type and margin to standardize the child components in the layout, and call certain functions to implement layout views based on parent and sibling components.

UISwipeView

When to Use

UISwipeView inherits from UIViewGroup. In addition to the Add, Remove, and Insert functions, UISwipeView provides the functions to swipe contents by page and center the current page after swiping. This component can be horizontally or vertically centered. Child components added via the Add function are automatically horizontally or vertically centered, adaptive to the UISwipeView direction, in the sequence they were added.

Available APIs

Table 1 Available functions in SwipeView

Development Procedure (Non-Cyclic Horizontal Swiping)

1. Create a horizontal swiping UISwipeView.

   UISwipeView* swipe = new UISwipeView(UISwipeView::HORIZONTAL);
   

2. Add child components to UISwipeView.

   UILabelButton* button1 = new UILabelButton();
   button1->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button1->SetText("button1");
   swipe->Add(button1);
   UILabelButton* button2 = new UILabelButton();
   button2->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button2->SetText("button2");
   swipe->Add(button2);
   UILabelButton* button3 = new UILabelButton();
   button3->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button3->SetText("button3");
   swipe->Add(button3);
   

3. Verify that the components are swiping horizontally but not cyclically.

   Figure 1 Horizontal swiping effect of UISwipeView

   

Development Procedure (Cyclic Horizontal Swiping)

1. Create a horizontal swiping UISwipeView and add its child components.

   UISwipeView* swipe = new UISwipeView(UISwipeView::HORIZONTAL);
   UILabelButton* button1 = new UILabelButton();
   button1->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button1->SetText("button1");
   swipe->Add(button1);
   UILabelButton* button2 = new UILabelButton();
   button2->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button2->SetText("button2");
   swipe->Add(button2);
   UILabelButton* button3 = new UILabelButton();
   button3->SetPosition(0, 0, g_ButtonW, g_ButtonH);
   button3->SetText("button3");
   swipe->Add(button3);
   

2. Enable cyclic swiping for the UISwipeView.

   swipe->SetLoopState(true);
   

3. Verify that the components are swiping horizontally and cyclically.

   Figure 2 Cyclic horizontal swiping effect of UISwipeView

   

GridLayout

When to Use

GridLayout provides the basic layout capability to set the number of grid rows and columns. Child components added via the Add function are automatically arranged after the LayoutChildren() function is called.

Available APIs

Table 2 Available functions in GridLayout

How to Develop

1. Create a GridLayout instance and set its position and size.

   GridLayout* layout_ = new GridLayout();
   layout_->SetPosition(0, g_y, HROIZONTAL_RESOLUTION, 200);
   layout_->SetLayoutDirection(LAYOUT_HOR);
   layout_->SetRows(2);
   layout_->SetCols(2);
   

2. Create UILabelButton instances.

   UILabelButton* bt1 = new UILabelButton();
   bt1->SetPosition(0,0,100,50);
   bt1->SetText("bt1");
   UILabelButton* bt2 = new UILabelButton();
   bt2->SetPosition(0, 0, 100, 50);
   bt2->SetText("bt2");
   UILabelButton* bt3 = new UILabelButton();
   bt3->SetPosition(0, 0, 100, 50);
   bt3->SetText("bt3");
   UILabelButton* bt4 = new UILabelButton();
   bt4->SetPosition(0, 0, 100, 50);
   bt4->SetText("bt4");
   

3. Add child components and call the LayoutChildren() function.

   layout_->Add(bt1);
   layout_->Add(bt2);
   layout_->Add(bt3);
   layout_->Add(bt4);
   layout_->LayoutChildren();
   

4. Verify the layout of buttons, as shown in the following figure.

   Figure 3 Setting a 2x2 grid and adding four buttons in a layout
   

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