os::DropdownMenu::DropdownView Class Reference

Inheritance diagram for os::DropdownMenu::DropdownView:

List of all members.

Public Member Functions
	DropdownView (DropdownMenu *pcParent)
virtual void	Paint (const Rect &cUpdateRect)
	Called by the system update "damaged" areas of the view.
virtual void	MouseDown (const Point &cPosition, uint32 nButtons)
	Hook called by the system when a mouse button is pressed.
virtual void	MouseUp (const Point &cPosition, uint32 nButtons, Message *pcData)
	Hook called by the system when a mouse button is release.
virtual void	MouseMove (const Point &cPosition, int nCode, uint32 nButtons, Message *pcData)
	Hook called by the system when the mouse is moved.
virtual void	KeyDown (const char *pzString, const char *pzRawString, uint32 nQualifiers)
	Hook called by the system when a key is pressed while the view has focus.
virtual void	AllAttached ()
virtual void	Activated (bool bIsActive)
	Hook called when the view gain or loose focus.
virtual void	WheelMoved (const Point &cDelta)
	Hook called by the system when the scroll-wheel is rotated.
virtual void	FontChanged (Font *pcNewFont)
	Called to notify the view that the font has changed.
virtual void	HandleMessage (Message *pcMessage)
	Handle a message targeted at this handler.
Friends
class	DropdownMenu

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Constructor & Destructor Documentation

os::DropdownMenu::DropdownView::DropdownView

(

DropdownMenu *

pcParent

)

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Member Function Documentation

void os::DropdownMenu::DropdownView::Paint

(

const Rect &

cUpdateRect

)

[virtual]

Description:

Note:

Warning:

Parameters:

cUpdateRect

A rectangle enclosing all damaged areas. This is just a rough "worst-case", further fine-grained clipping will be performed by the Application Server to avoid updating non-damaged pixels and make the update as fast and flicker-free as possible.

See also:

Invalidate(), Flush()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::MouseDown	(	const Point &	cPosition,
		uint32	nButtons
	)			[virtual]

Description:

This member is called from the window thread whenever a mouse button is clicked above the view. You can overload this member if your view need to know about mouse-down events.

A view will not automatically take focus when clicked so if you want that behaviour you must call MakeFocus() from an overloaded version of this member.

The default implementation of this member will call MouseDown() on it's parent view if one exists.

Parameters:

	cPosition	Mouse position in the views coordinate system at the time the mouse was pressed.
	nButtons	Index of the pressed button. Buttons start at 1 for the left button, 2 for the right button, 3 for the middle button. Additional buttons might be supported by the mouse driver and will then be assigned numbers from 4 and up.

See also:

MouseUp(), MouseMove(), WheelMoved()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::MouseUp	(	const Point &	cPosition,
		uint32	nButtons,
		Message *	pcData
	)			[virtual]

Description:

This member is called from the window thread whenever a mouse button is released above the view. You can overload this member if your view need to know about mouse-up events or if your view support drag and drop.

If mouse-up was the result of ending a drag and drop operation the pcData member will point to a Message containing the dragged data. Look at BeginDrag() for a more detailed description of the drag and drop system.

The default implementation of this member will call MouseDown() on it's parent view if one exists.

Parameters:

	cPosition	Mouse position in the views coordinate system at the time the mouse was pressed.
	nButtons	Index of the pressed button. Buttons start at 1 for the left button, 2 for the right button, 3 for the middle button. Additional buttons might be supported by the mouse driver and will then be assigned numbers from 4 and up.
	pcData	Pointer to a Message object containing the dragged data if this mouse-up was the end of a drag and drop operation. If no data was dragged it will be NULL.

See also:

MouseDown(), MouseMove(), WheelMoved()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::MouseMove	(	const Point &	cPosition,
		int	nCode,
		uint32	nButtons,
		Message *	pcData
	)			[virtual]

Description:

This member is called from the window thread whenever the mouse is moved above the view or if the view has focus.

Oveload this member if your view need to handle mouse-move events.

The default implementation of this member will call MouseMove() on it's parent view if one exists.

Parameters:

	cNewPos	New mouse position given in the views coordinate system.
	nCode	Enter/exit code. This is MOUSE_ENTERED when the mouse first enter the view, MOUSE_EXITED when the mouse leaves the view, MOUSE_INSIDE whenever the mouse move withing the boundary of the view and MOUSE_OUTSIDE when the mouse move outside the view (will only happen if the view has focus).
	nButtons	Bitmask telling which buttons that are currently pressed. Bit 0 is button 1 (left), bit 1 is button 2 (right), and bit 2 is button 3 (middle), and so on.
	pcData	Pointer to a Message object containing the dragged data if the user is in the middle of a drag and drop operation. Otherwise this pointer is NULL. Look at BeginDrag() for a more detailed description of the drag and drop system.

See also:

MouseDown(), MouseUp(), WheelMoved(), BeginDrag()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::KeyDown	(	const char *	pzString,
		const char *	pzRawString,
		uint32	nQualifiers
	)			[virtual]

Description:

Overload this member if your view need to handle keyboard input. This member is called to allow the view to handle M_KEY_DOWN messages. The most common members are exctracted from the message and passed as parameters but you might need to obtain the raw message with os::Looper::GetCurrentMessage() and find some members yourself if you the data you needed are not passed in.

For example if you need the raw key-code for the pressed key you will have to lookup the "_raw_key" member from the message.

Parameters:

	pzString	String containing a single UTF-8 encoded character. This is the character generated by the pressed key according to the current keymap accounting for any qualifiers that might be pressed.
	pzRawString	Same as pzString except that the key is converted without accounting for qualifiers. Ie. if 'A' is pressed while pressing <SHIFT> pzString will contain 'A' and pzRawString will contain 'a'.
	nQualifiers	Bitmask describing which qualifiers that was active when the key was pressed.

See also:

KeyUp(), os::Looper::GetCurrentMessage()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::AllAttached

(

)

[virtual]

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::Activated

(

bool

bIsActive

)

[virtual]

Description:

This is a callback member that can be overloaded by derived classes to learn when the view is activated and when it is deactivated. The bIsActive parameter tell whether the focus was lost or gained.

The view has focus when it is the active view in the active window.

Note:

This is a hook function that is called by the system to notify about an event. You should never call this member yourself.

The window is locked when this member is called.

Parameters:

bIsActive

- true if the view gain and false if it loose focus.

See also:

MakeFocus(), WindowActivated()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::WheelMoved

(

const Point &

cDelta

)

[virtual]

Description:

This member is called from the window thread whenever the user rotates the scroll wheel with the mouse pointer above this view.

The default implementation of this member will call WheelMoved() on it's parent view if one exists.

Since:

V0.3.7

Parameters:

cDelta

Delta movement. Normally only the y value is used but it is possible for the mouse driver to also support horizontal scroll wheel functionality. The delta value is normally +/- 1.0 for each "click" on the wheel.

See also:

MouseMove(), MouseDown(), MouseUp()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::FontChanged

(

Font *

pcNewFont

)

[virtual]

Description:

FontChanged() is a virtual hook function that can be overloaded by inheriting classes to track changes to the view's font.

This hook function is called whenver the font is replaced through the View::SetFont() member or if the currently assigned font is modified in a way that whould alter the graphical appearance of the font.

Note:

View::SetFont() will call FontChanged() syncronously and will cause FontChanged() to be called even if the view is not yet added to a window. Changes done to the font-object cause a message to be sendt to the window thread and FontChanged() will then be called asyncronously from the window thread when the message arrive. For this reason it is only possible to track changes done to the font object itself when the view is added to a window.

Parameters:

pcNewFont

Pointer to the affected font (same as returned by GetFont()).

See also:

SetFont(), os::Font

Author:

Kurt Skauen ([email protected])

Reimplemented from os::View.

void os::DropdownMenu::DropdownView::HandleMessage

(

Message *

pcMessage

)

[virtual]

Description:

Overload this member to dispatch messages sendt to this handler. When a looper receives a message for one of it's handlers it will call the taget handlers HandleMessage() to allow the handler to dispatch the message.

The message passed in pcMessage is also available through os::Looper::GetCurrentMessage() and os::Looper::DetachCurrentMessage() until this member returns. This is normally not very usefull for HandleMessage() itself but it can be convinient for other members called from HandleMessage() in case they need data from the message that was not passed on from HandleMessage().

The looper will be locked when this member is called. The default implementation of this member will pass the message on to the next handler if one was set with SetNextHandler().

Note:

Never do any lenthy operations in any hook members that are called from the looper thread if the looper is involved with the GUI (for example if the looper is a os::Window). The looper will not be able to dispatch messages until the hook returns so spending a long time in this members will make the GUI feel unresponsive.

Parameters:

pcMessage

The message that should be handled. This message will be deleted by the looper when HandleMessage() returns unless you detach it with os::Looper::DetachCurrentMessage(),

See also:

os::Looper::DispatchMessage(), os::Looper::DetachCurrentMessage()

Author:

Kurt Skauen ([email protected])

Reimplemented from os::Handler.

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Friends And Related Function Documentation

friend class DropdownMenu [friend]

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