Class evab::LayoutBase¶

ClassList > evab > LayoutBase

Abstract base class for composite elements with circular focus chain. More...

#include <evabLayoutBase.h>

Inherits the following classes: evab::ElementBase

Public Functions¶

Type	Name
ElementBase *	GetFocused () const Gets the current (focused) child.
void	Increment (signed char delta) Increments the selection by a delta.
bool	IsFocused (FocusableBase * aChild) Checks if a child is currently focused.
virtual bool	OnKey (Keys aKey) override Handles key events by forwarding to focused child.

Public Functions inherited from evab::ElementBase¶

See evab::ElementBase

Type	Name
void	Draw (Screen * aScreen, Coor aPos, Coor aSize, unsigned char aIsFocused) Draws the element on the specified screen.
void	Freeze () Make element insensitive to redraw method.
virtual bool	OnKey (Keys aKey) Handles key events for the element.

Protected Functions¶

Type	Name
void	focusChild (FocusableBase * aChild) Sets the current (focused) child.

Protected Functions inherited from evab::ElementBase¶

See evab::ElementBase

Type	Name
virtual void	drawer (Screen * aScreen, Coor aPos, Coor aSize, unsigned char aIsFocused) = 0 Pure virtual method for drawing the element.
virtual void	freezer () Virtual method for freezing the element.
bool	isFrozen () Checks if the element is currently freezed.
void	redraw () Redraws the element on the current screen.

Detailed Description¶

Manages a circular linked list of child elements for focus navigation. Only stores one pointer - to the currently focused child. Children must be of type Focusable<T> to form the chain.

Public Functions Documentation¶

function GetFocused¶

Gets the current (focused) child.

ElementBase * evab::LayoutBase::GetFocused () const

Returns:

Pointer to current child, or nullptr if none

function Increment¶

Increments the selection by a delta.

void evab::LayoutBase::Increment (
    signed char delta
)

Positive delta moves forward (next), negative moves backward (prev)

Parameters:

delta Amount to increment (positive or negative)

function IsFocused¶

Checks if a child is currently focused.

bool evab::LayoutBase::IsFocused (
    FocusableBase * aChild
)

Parameters:

aChild Child element to check

Returns:

true if the child is focused

function OnKey¶

Handles key events by forwarding to focused child.

virtual bool evab::LayoutBase::OnKey (
    Keys aKey
) override

Parameters:

aKey Key code to process

Returns:

true if the key was handled, false otherwise

Implements evab::ElementBase::OnKey

Protected Functions Documentation¶

function focusChild¶

Sets the current (focused) child.

void evab::LayoutBase::focusChild (
    FocusableBase * aChild
)

Parameters:

aChild Child element to set as focused

The documentation for this class was generated from the following file src/evabLayoutBase.h