/**
* The initializationMonitoringFunction is run once per frame by the Cycle method of the POST page.
* When it returns TRUE, the application switches to the first page that comes after the POST page.
* If There is no other page than the POST page, then nothing will happen.
*/
public MyOnScreenApplication WithDefaultPostPage(Func <MyOnScreenApplication, bool> initializationMonitoringFunction)
{
// Make sure the POST page is the first one added
if (Pages.Count() > 0)
{
throw new InvalidOperationException("The POST page must be the first page ever added to the application");
}
// Enforce the order of builder operations to avoid null pointer exceptions
if (Canvas == null)
{
throw new InvalidOperationException("Please call WithCanvas() before calling WithDefaultPostPage()");
}
// Make sure the initialization function is set
if (initializationMonitoringFunction == null)
{
throw new ArgumentException("The initialization monitoring function must be a lambda taking in a MyOnScreenObject and returning a bool");
}
// Create the POST page and give it the functionality of switching to the next page once
// the initialization monitoring function returns true
MyPage POSTPage = (MyPage) new MyPage()
.WithInvertedColors()
.WithClientPreDrawMethod((MyCanvas TargetCanvas, int iterationIndex) => {
TargetCanvas.Clear();
})
.WithClientCycleMethod((MyOnScreenObject obj, int iterationIndex) => {
if (initializationMonitoringFunction(this))
{
SwitchToPage(1); // will do nothing if the page does not exist
}
});
// Add the POST page to the application
this.AddPage(POSTPage);
// Add another filled panel to the POST page, to serve as background for the INITIALIZING text
MyPanel TextBackgroundPanel = new MyPanel(0, 0, 2, 2).WithOptionalParameters(true, true, false);
POSTPage.AddChild(TextBackgroundPanel);
// Add the INIIALIZING text label to the POST page
MyTextLabel TextLabel = new MyTextLabel("INITIALIZING", 1, 1).WithOptionalParameters(true, true, true);
POSTPage.AddChild(TextLabel);
// Compute the location and dimensions of the text and that of its back panel based on
// the resolution of the Canvas
int textLabelWidth = TextLabel.GetWidth();
int textLabelHeight = TextLabel.GetHeight();
// Update the label coordinates
TextLabel.x = (Canvas.GetResX() - textLabelWidth) / 2;
TextLabel.y = (Canvas.GetResY() - textLabelHeight) / 2 - 3;
// Update the panel coordinates (the drawing framework handles overflows)
TextBackgroundPanel.x = TextLabel.x - 3;
TextBackgroundPanel.y = TextLabel.y - 2;
TextBackgroundPanel.SetWidth(textLabelWidth + 6);
TextBackgroundPanel.SetHeight(textLabelHeight + 3);
// Add the moving square (a panel with some simple animation logic)
POSTPage.AddChild(
new MyPanel(TextBackgroundPanel.x, TextBackgroundPanel.y + TextBackgroundPanel.GetHeight() + 2, 7, 4)
.WithOptionalParameters(true, true, false)
.WithClientCycleMethod((MyOnScreenObject obj, int iterationIndex) => {
obj.x++;
if (obj.x > TextBackgroundPanel.x + TextBackgroundPanel.GetWidth() - 7)
{
obj.x = TextBackgroundPanel.x;
}
})
);
return(this);
}
private void UpdateItemPositions()
{
// If the list is empty, don't do anything
if (Items.Count() == 0)
{
return;
}
// If there's just one item per page, then the selected item has to be
// placed in the middle of the page, while all the other items are to
// be hidden
if (oneItemPerPage)
{
foreach (MyOnScreenObject Item in Items)
{
if (Item == SelectedItem)
{
Item.isVisible = true;
Item.x = ComputeItemHorizontalPosition(Item);
Item.y = (Panel.GetHeight() - Item.GetHeight()) / 2;
}
else
{
Item.isVisible = false;
}
Item.invertColors = false;
}
SelectionBackground.isVisible = false;
}
// If there are many items per page
else
{
// Compute the max list height, as it will be needed later
int listMaxHeight = GetHeight() - (padding * 2);
// Update the startPosY:
// - if the selected item is above the top margin of the list box,
// then make it so the selected item is at the top of the list box
// - if the selected item is below the bottom margin of the list box,
// then make it so the selected item is at the bottom of the list box
// Get the current y position of the selected item based on the
// previously set startPosY
int selItemY = startPosY;
for (int idx = 0; idx < selectedItemIndex; idx++)
{
selItemY += Items[idx].GetHeight();
}
// Update the startPosY, if required
if (selItemY < padding)
{
startPosY += padding - selItemY;
}
else if (selItemY + SelectedItem.GetHeight() > listMaxHeight)
{
startPosY -= selItemY + SelectedItem.GetHeight() - listMaxHeight;
}
// Once the startPosY has been updated, the items may be layed out vertically
// Update item vertical positions
int currPosY = startPosY;
foreach (MyOnScreenObject Item in Items)
{
Item.y = currPosY;
Item.x = ComputeItemHorizontalPosition(Item);
currPosY += Item.GetHeight();
Item.isVisible = Item.y >= padding && Item.y + Item.GetHeight() <= listMaxHeight;
Item.invertColors = Item == SelectedItem;
}
// Update the vertical position of the selection background
SelectionBackground.x = padding;
SelectionBackground.y = SelectedItem.y;
SelectionBackground.SetWidth(GetWidth() - Scrollbar.GetWidth() - (padding * 2));
SelectionBackground.SetHeight(SelectedItem.GetHeight());
SelectionBackground.isVisible = true;
}
}
