-spec calcScrolledPosition(This, X, Y) -> {Xx :: integer(), Yy :: integer()}
                              when This :: wxScrolledWindow(), X :: integer(), Y :: integer().

Translates the logical coordinates to the device ones.

For example, if a window is scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0) (as always), but the logical coordinates are (0, 10) and so the call to CalcScrolledPosition(0, 10, xx, yy) will return 0 in yy.

See: calcUnscrolledPosition/3

-spec calcUnscrolledPosition(This, X, Y) -> {Xx :: integer(), Yy :: integer()}
                                when This :: wxScrolledWindow(), X :: integer(), Y :: integer().

Translates the device coordinates to the logical ones.

For example, if a window is scrolled 10 pixels to the bottom, the device coordinates of the origin are (0, 0) (as always), but the logical coordinates are (0, 10) and so the call to CalcUnscrolledPosition(0, 0, xx, yy) will return 10 in yy.

See: calcScrolledPosition/3

-spec destroy(This :: wxScrolledWindow()) -> ok.

Destroys the object.

-spec doPrepareDC(This, Dc) -> ok when This :: wxScrolledWindow(), Dc :: wxDC:wxDC().

Call this function to prepare the device context for drawing a scrolled image.

It sets the device origin according to the current scroll position. doPrepareDC/2 is called automatically within the default wxEVT_PAINT event handler, so your OnDraw() (not implemented in wx) override will be passed an already 'pre-scrolled' device context. However, if you wish to draw from outside of OnDraw() (not implemented in wx) (e.g. from your own wxEVT_PAINT handler), you must call this function yourself.

For example:

Notice that the function sets the origin by moving it relatively to the current origin position, so you shouldn't change the origin before calling doPrepareDC/2 or, if you do, reset it to (0, 0) later. If you call doPrepareDC/2 immediately after device context creation, as in the example above, this problem doesn't arise, of course, so it is customary to do it like this.

-spec enableScrolling(This, XScrolling, YScrolling) -> ok
                         when
                             This :: wxScrolledWindow(),
                             XScrolling :: boolean(),
                             YScrolling :: boolean().

Enable or disable use of wxWindow:scrollWindow/4 for scrolling.

By default, when a scrolled window is logically scrolled, wxWindow:scrollWindow/4 is called on the underlying window which scrolls the window contents and only invalidates the part of the window newly brought into view. If false is passed as an argument, then this "physical scrolling" is disabled and the window is entirely invalidated whenever it is scrolled by calling wxWindow:refresh/2.

It should be rarely necessary to disable physical scrolling, so this method shouldn't be called in normal circumstances.

-spec getScrollPixelsPerUnit(This) -> {XUnit :: integer(), YUnit :: integer()}
                                when This :: wxScrolledWindow().

Get the number of pixels per scroll unit (line), in each direction, as set by setScrollbars/6.

A value of zero indicates no scrolling in that direction.

See: setScrollbars/6, wxWindow:getVirtualSize/1

-spec getViewStart(This) -> {X :: integer(), Y :: integer()} when This :: wxScrolledWindow().

This is a simple overload of GetViewStart(int,int); see that function for more info.

-spec new() -> wxScrolledWindow().

Default constructor.

-spec new(Parent, [Option]) -> wxScrolledWindow()
             when
                 Parent :: wxWindow:wxWindow(),
                 Option ::
                     {winid, integer()} |
                     {pos, {X :: integer(), Y :: integer()}} |
                     {size, {W :: integer(), H :: integer()}} |
                     {style, integer()}.

Constructor.

Remark: The window is initially created without visible scrollbars. Call setScrollbars/6 to specify how big the virtual window size should be.

-spec prepareDC(This, Dc) -> ok when This :: wxScrolledWindow(), Dc :: wxDC:wxDC().

This function is for backwards compatibility only and simply calls doPrepareDC/2 now.

Notice that it is not called by the default paint event handle (doPrepareDC/2 is), so overriding this method in your derived class is useless.

-spec scroll(This, Pt) -> ok when This :: wxScrolledWindow(), Pt :: {X :: integer(), Y :: integer()}.

This is an overload of scroll/3; see that function for more info.

-spec scroll(This, X, Y) -> ok when This :: wxScrolledWindow(), X :: integer(), Y :: integer().

Scrolls a window so the view start is at the given point.

Remark: The positions are in scroll units, not pixels, so to convert to pixels you will have to multiply by the number of pixels per scroll increment. If either parameter is ?wxDefaultCoord (-1), that position will be ignored (no change in that direction).

See: setScrollbars/6, getScrollPixelsPerUnit/1

-spec setScrollbars(This, PixelsPerUnitX, PixelsPerUnitY, NoUnitsX, NoUnitsY, [Option]) -> ok
                       when
                           This :: wxScrolledWindow(),
                           PixelsPerUnitX :: integer(),
                           PixelsPerUnitY :: integer(),
                           NoUnitsX :: integer(),
                           NoUnitsY :: integer(),
                           Option :: {xPos, integer()} | {yPos, integer()} | {noRefresh, boolean()}.

Sets up vertical and/or horizontal scrollbars.

The first pair of parameters give the number of pixels per 'scroll step', i.e. amount moved when the up or down scroll arrows are pressed. The second pair gives the length of scrollbar in scroll steps, which sets the size of the virtual window.

xPos and yPos optionally specify a position to scroll to immediately.

For example, the following gives a window horizontal and vertical scrollbars with 20 pixels per scroll step, and a size of 50 steps (1000 pixels) in each direction:

wxScrolled (not implemented in wx) manages the page size itself, using the current client window size as the page size.

Note that for more sophisticated scrolling applications, for example where scroll steps may be variable according to the position in the document, it will be necessary to derive a new class from wxWindow, overriding OnSize() and adjusting the scrollbars appropriately.

See: wxWindow:setVirtualSize/3

-spec setScrollRate(This, Xstep, Ystep) -> ok
                       when This :: wxScrolledWindow(), Xstep :: integer(), Ystep :: integer().

Set the horizontal and vertical scrolling increment only.

See the pixelsPerUnit parameter in setScrollbars/6.

-spec setTargetWindow(This, Window) -> ok when This :: wxScrolledWindow(), Window :: wxWindow:wxWindow().

Call this function to tell wxScrolled (not implemented in wx) to perform the actual scrolling on a different window (and not on itself).

This method is useful when only a part of the window should be scrolled. A typical example is a control consisting of a fixed header and the scrollable contents window: the scrollbars are attached to the main window itself, hence it, and not the contents window must be derived from wxScrolled (not implemented in wx), but only the contents window scrolls when the scrollbars are used. To implement such setup, you need to call this method with the contents window as argument.

Notice that if this method is used, GetSizeAvailableForScrollTarget() (not implemented in wx) method must be overridden.