demotool/window.hh

#pragma once
#ifndef REAL_BUILD
# include "externals.hh"
#endif


// Base class for a modal dialog that can be pushed to the window's modal
// stack.
class A_ModalDialog
{
    private:
	const T_String id_;
	bool open_{ false };
	T_Optional< ImVec2 > initialSize_;

    protected:
	A_ModalDialog( char const* id ) noexcept;

	void setInitialSize( const float width ,
			const float height ) noexcept
		{ initialSize_.setNew( width , height ); }

	// Initialisation, called right before the window is opened.
	// Does nothing by default.
	virtual void initDialog( ) noexcept;

	// Draw the dialog box's contents, returns true if the OK button
	// should be enabled.
	virtual bool drawDialog( ) noexcept = 0;

	// Handlers for both OK and Cancel. The former must be overridden,
	// the latter defaults to "do nothing".
	virtual void onOK( ) noexcept = 0;
	virtual void onCancel( ) noexcept;

    public:
	NO_COPY( A_ModalDialog );
	NO_MOVE( A_ModalDialog );
	virtual ~A_ModalDialog( );

	// Draw and handle the dialog box. Returns true if it must be kept,
	// or false if it must be removed from the stack.
	bool draw( ) noexcept;
};
using P_ModalDialog = T_OwnPtr< A_ModalDialog >;


struct T_Window
{
	T_Window( );
	~T_Window( );

	void startFrame( const bool capture ,
			ImVec2 const& mouseInitial ) const;
	void warpMouse( ImVec2 const& pos ) const;

	void swap( ) const;

	void pushDialog( P_ModalDialog dialog ) noexcept
		{ modals_.add( std::move( dialog ) ); }
	void handleDialogs( ) noexcept;

	ImFont* defaultFont( ) const noexcept
		{ return defaultFont_; }
	ImFont* smallFont( ) const noexcept
		{ return smallFont_; }

    private:
	SDL_Window * window;
	SDL_GLContext gl;
	ImFont* defaultFont_;
	ImFont* smallFont_;
	T_AutoArray< P_ModalDialog , 8 > modals_;
};