wxWidgets: wxVarHVScrollHelper Class Reference

| Version: 3.2.5

Public Member Functions | List of all members
wxVarHVScrollHelper Class Reference
Class List by Category » Miscellaneous Windows

`#include <wx/vscroll.h>`

Inheritance diagram for wxVarHVScrollHelper:
[legend]

## Detailed Description

This class provides functions wrapping the wxVarHScrollHelper and wxVarVScrollHelper classes, targeted for scrolling a window in both axis.

Since this class is also the join class of the horizontal and vertical scrolling functionality, it also addresses some wrappers that help avoid the need to specify class scope in your wxHVScrolledWindow derived class when using wxVarScrollHelperBase functionality.

Like all three of its scroll helper base classes, this class is mostly only useful to those classes built into wxWidgets deriving from here, and this documentation is mostly only provided for referencing the functions provided by this class. You will likely want to derive your window from wxHVScrolledWindow rather than from here directly.

##

Library: wxCore
Category: Miscellaneous Windows

See also
  wxHScrolledWindow, wxHVScrolledWindow, wxVScrolledWindow

## Public Member Functions
| wxVarHVScrollHelper (wxWindow *winToScroll)
| Constructor taking the target window to be scrolled by this helper class. More...
void | EnablePhysicalScrolling (bool vscrolling=true, bool hscrolling=true)
| With physical scrolling on (when this is true), the device origin is changed properly when a wxPaintDC is prepared, children are actually moved and laid out properly, and the contents of the window (pixels) are actually moved. More...
wxSize | GetRowColumnCount () const
| Returns the number of columns and rows the target window contains. More...
wxPosition | GetVisibleBegin () const
| Returns the index of the first visible column and row based on the current scroll position. More...
wxPosition | GetVisibleEnd () const
| Returns the index of the last visible column and row based on the scroll position. More...
void | SetRowColumnCount (size_t rowCount, size_t columnCount)
| Set the number of rows and columns the target window will contain. More...
bool | IsVisible (size_t row, size_t column) const
| Returns true if both the given row and column are currently visible (even if only partially visible) or false otherwise. More...
bool | IsVisible (const wxPosition &pos) const
| Returns true if both the given row and column are currently visible (even if only partially visible) or false otherwise. More...
virtual void | RefreshRowColumn (size_t row, size_t column)
| Triggers a refresh for just the area shared between the given row and column of the window if it is visible. More...
virtual void | RefreshRowColumn (const wxPosition &pos)
| Triggers a refresh for just the area shared between the given row and column of the window if it is visible. More...
virtual void | RefreshRowsColumns (size_t fromRow, size_t toRow, size_t fromColumn, size_t toColumn)
| Triggers a refresh for the visible area shared between all given rows and columns (inclusive) of the window. More...
virtual void | RefreshRowsColumns (const wxPosition &from, const wxPosition &to)
| Triggers a refresh for the visible area shared between all given rows and columns (inclusive) of the window. More...
bool | ScrollToRowColumn (size_t row, size_t column)
| Scroll to the specified row and column. More...
bool | ScrollToRowColumn (const wxPosition &pos)
| Scroll to the specified row and column. More...
wxPosition | VirtualHitTest (wxCoord x, wxCoord y) const
| Returns the virtual scroll unit under the device unit given accounting for scroll position or `wxNOT_FOUND` (for the row, column, or possibly both values) if none. More...
wxPosition | VirtualHitTest (const wxPoint &pos) const
| Returns the virtual scroll unit under the device unit given accounting for scroll position or `wxNOT_FOUND` (for the row, column, or possibly both values) if none. More...
Public Member Functions inherited from wxVarVScrollHelper
| wxVarVScrollHelper (wxWindow *winToScroll)
| Constructor taking the target window to be scrolled by this helper class. More...
size_t | GetRowCount () const
| Returns the number of rows the target window contains. More...
size_t | GetVisibleRowsBegin () const
| Returns the index of the first visible row based on the scroll position. More...
size_t | GetVisibleRowsEnd () const
| Returns the index of the last visible row based on the scroll position. More...
bool | IsRowVisible (size_t row) const
| Returns true if the given row is currently visible (even if only partially visible) or false otherwise. More...
virtual void | RefreshRow (size_t row)
| Triggers a refresh for just the given row's area of the window if it's visible. More...
virtual void | RefreshRows (size_t from, size_t to)
| Triggers a refresh for the area between the specified range of rows given (inclusively). More...
virtual bool | ScrollRowPages (int pages)
| Scroll by the specified number of pages which may be positive (to scroll down) or negative (to scroll up). More...
virtual bool | ScrollRows (int rows)
| Scroll by the specified number of rows which may be positive (to scroll down) or negative (to scroll up). More...
bool | ScrollToRow (size_t row)
| Scroll to the specified row. More...
void | SetRowCount (size_t rowCount)
| Set the number of rows the window contains. More...
Public Member Functions inherited from wxVarScrollHelperBase
| wxVarScrollHelperBase (wxWindow *winToScroll)
| Constructor taking the target window to be scrolled by this helper class. More...
virtual | ~wxVarScrollHelperBase ()
| Virtual destructor for detaching scroll event handlers attached with this helper class. More...
int | CalcScrolledPosition (int coord) const
| Translates the logical coordinate given to the current device coordinate. More...
int | CalcUnscrolledPosition (int coord) const
| Translates the device coordinate given to the corresponding logical coordinate. More...
void | EnablePhysicalScrolling (bool scrolling=true)
| With physical scrolling on (when this is true), the device origin is changed properly when a wxPaintDC is prepared, children are actually moved and laid out properly, and the contents of the window (pixels) are actually moved. More...
virtual int | GetNonOrientationTargetSize () const =0
| This function needs to be overridden in the in the derived class to return the window size with respect to the opposing orientation. More...
virtual wxOrientation | GetOrientation () const =0
| This function need to be overridden to return the orientation that this helper is working with, either `wxHORIZONTAL` or `wxVERTICAL`. More...
virtual int | GetOrientationTargetSize () const =0
| This function needs to be overridden in the in the derived class to return the window size with respect to the orientation this helper is working with. More...
virtual wxWindow * | GetTargetWindow () const
| This function will return the target window this helper class is currently scrolling. More...
size_t | GetVisibleBegin () const
| Returns the index of the first visible unit based on the scroll position. More...
size_t | GetVisibleEnd () const
| Returns the index of the last visible unit based on the scroll position. More...
bool | IsVisible (size_t unit) const
| Returns true if the given scroll unit is currently visible (even if only partially visible) or false otherwise. More...
virtual void | RefreshAll ()
| Recalculate all parameters and repaint all units. More...
virtual void | SetTargetWindow (wxWindow *target)
| Normally the window will scroll itself, but in some rare occasions you might want it to scroll (part of) another window (e.g. More...
virtual void | UpdateScrollbar ()
| Update the thumb size shown by the scrollbar. More...
int | VirtualHitTest (wxCoord coord) const
| Returns the virtual scroll unit under the device unit given accounting for scroll position or `wxNOT_FOUND` if none (i.e. More...
Public Member Functions inherited from wxVarHScrollHelper
| wxVarHScrollHelper (wxWindow *winToScroll)
| Constructor taking the target window to be scrolled by this helper class. More...
size_t | GetColumnCount () const
| Returns the number of columns the target window contains. More...
size_t | GetVisibleColumnsBegin () const
| Returns the index of the first visible column based on the scroll position. More...
size_t | GetVisibleColumnsEnd () const
| Returns the index of the last visible column based on the scroll position. More...
bool | IsColumnVisible (size_t column) const
| Returns true if the given column is currently visible (even if only partially visible) or false otherwise. More...
virtual void | RefreshColumn (size_t column)
| Triggers a refresh for just the given column's area of the window if it's visible. More...
virtual void | RefreshColumns (size_t from, size_t to)
| Triggers a refresh for the area between the specified range of columns given (inclusively). More...
virtual bool | ScrollColumnPages (int pages)
| Scroll by the specified number of pages which may be positive (to scroll right) or negative (to scroll left). More...
virtual bool | ScrollColumns (int columns)
| Scroll by the specified number of columns which may be positive (to scroll right) or negative (to scroll left). More...
bool | ScrollToColumn (size_t column)
| Scroll to the specified column. More...
void | SetColumnCount (size_t columnCount)
| Set the number of columns the window contains. More...

## Additional Inherited Members
Protected Member Functions inherited from wxVarVScrollHelper
virtual void | OnGetRowsHeightHint (size_t rowMin, size_t rowMax) const
| This function doesn't have to be overridden but it may be useful to do so if calculating the rows' sizes is a relatively expensive operation as it gives your code a chance to calculate several of them at once and cache the result if necessary. More...
virtual wxCoord | EstimateTotalHeight () const
| This class forwards calls from EstimateTotalSize() to this function so derived classes can override either just the height or the width estimation, or just estimate both differently if desired in any wxHVScrolledWindow derived class. More...
virtual wxCoord | OnGetRowHeight (size_t row) const =0
| This function must be overridden in the derived class, and should return the height of the given row in pixels. More...
Protected Member Functions inherited from wxVarScrollHelperBase
virtual void | OnGetUnitsSizeHint (size_t unitMin, size_t unitMax) const
| This function doesn't have to be overridden but it may be useful to do so if calculating the units' sizes is a relatively expensive operation as it gives your code a chance to calculate several of them at once and cache the result if necessary. More...
virtual wxCoord | EstimateTotalSize () const
| When the number of scroll units change, we try to estimate the total size of all units when the full window size is needed (i.e. More...
virtual wxCoord | OnGetUnitSize (size_t unit) const =0
| This function must be overridden in the derived class, and should return the size of the given unit in pixels. More...
Protected Member Functions inherited from wxVarHScrollHelper
virtual wxCoord | EstimateTotalWidth () const
| This class forwards calls from EstimateTotalSize() to this function so derived classes can override either just the height or the width estimation, or just estimate both differently if desired in any wxHVScrolledWindow derived class. More...
virtual void | OnGetColumnsWidthHint (size_t columnMin, size_t columnMax) const
| This function doesn't have to be overridden but it may be useful to do so if calculating the columns' sizes is a relatively expensive operation as it gives your code a chance to calculate several of them at once and cache the result if necessary. More...
virtual wxCoord | OnGetColumnWidth (size_t column) const =0
| This function must be overridden in the derived class, and should return the width of the given column in pixels. More...

## Constructor & Destructor Documentation

## ◆ wxVarHVScrollHelper()

wxVarHVScrollHelper::wxVarHVScrollHelper | ( | wxWindow * | winToScroll | ) |

Constructor taking the target window to be scrolled by this helper class.

This will attach scroll event handlers to the target window to catch and handle scroll events appropriately.

## Member Function Documentation

## ◆ EnablePhysicalScrolling()

void wxVarHVScrollHelper::EnablePhysicalScrolling | ( | bool | vscrolling = `true`,
|  | bool | hscrolling = `true`
| ) |  |

With physical scrolling on (when this is true), the device origin is changed properly when a wxPaintDC is prepared, children are actually moved and laid out properly, and the contents of the window (pixels) are actually moved.

When this is false, you are responsible for repainting any invalidated areas of the window yourself to account for the new scroll position.

Parameters

  vscrolling | Specifies if physical scrolling should be turned on when scrolling vertically.
  hscrolling | Specifies if physical scrolling should be turned on when scrolling horizontally.

## ◆ GetRowColumnCount()

wxSize wxVarHVScrollHelper::GetRowColumnCount | ( |  | ) | const

Returns the number of columns and rows the target window contains.

See also
  SetRowColumnCount()

## ◆ GetVisibleBegin()

wxPosition wxVarHVScrollHelper::GetVisibleBegin | ( |  | ) | const

Returns the index of the first visible column and row based on the current scroll position.

## ◆ GetVisibleEnd()

wxPosition wxVarHVScrollHelper::GetVisibleEnd | ( |  | ) | const

Returns the index of the last visible column and row based on the scroll position.

This includes any partially visible columns or rows.

## ◆ IsVisible() [1/2]

bool wxVarHVScrollHelper::IsVisible | ( | const wxPosition & | pos | ) | const

Returns true if both the given row and column are currently visible (even if only partially visible) or false otherwise.

## ◆ IsVisible() [2/2]

bool wxVarHVScrollHelper::IsVisible | ( | size_t | row,
|  | size_t | column
| ) |  | const

Returns true if both the given row and column are currently visible (even if only partially visible) or false otherwise.

## ◆ RefreshRowColumn() [1/2]

virtual void wxVarHVScrollHelper::RefreshRowColumn | ( | const wxPosition & | pos | ) |
| virtual

Triggers a refresh for just the area shared between the given row and column of the window if it is visible.

## ◆ RefreshRowColumn() [2/2]

virtual void wxVarHVScrollHelper::RefreshRowColumn | ( | size_t | row,
|  | size_t | column
| ) |  |
| virtual

Triggers a refresh for just the area shared between the given row and column of the window if it is visible.

## ◆ RefreshRowsColumns() [1/2]

virtual void wxVarHVScrollHelper::RefreshRowsColumns | ( | const wxPosition & | from,
|  | const wxPosition & | to
| ) |  |
| virtual

Triggers a refresh for the visible area shared between all given rows and columns (inclusive) of the window.

If the target window for both orientations is the same, the rectangle of cells is refreshed; if the target windows differ, the entire client size opposite the orientation direction is refreshed between the specified limits.

## ◆ RefreshRowsColumns() [2/2]

virtual void wxVarHVScrollHelper::RefreshRowsColumns | ( | size_t | fromRow,
|  | size_t | toRow,
|  | size_t | fromColumn,
|  | size_t | toColumn
| ) |  |
| virtual

Triggers a refresh for the visible area shared between all given rows and columns (inclusive) of the window.

If the target window for both orientations is the same, the rectangle of cells is refreshed; if the target windows differ, the entire client size opposite the orientation direction is refreshed between the specified limits.

## ◆ ScrollToRowColumn() [1/2]

bool wxVarHVScrollHelper::ScrollToRowColumn | ( | const wxPosition & | pos | ) |

Scroll to the specified row and column.

It will become the first visible row and column in the window. Returns true if we scrolled the window, false if nothing was done.

## ◆ ScrollToRowColumn() [2/2]

bool wxVarHVScrollHelper::ScrollToRowColumn | ( | size_t | row,
|  | size_t | column
| ) |  |

Scroll to the specified row and column.

It will become the first visible row and column in the window. Returns true if we scrolled the window, false if nothing was done.

## ◆ SetRowColumnCount()

void wxVarHVScrollHelper::SetRowColumnCount | ( | size_t | rowCount,
|  | size_t | columnCount
| ) |  |

Set the number of rows and columns the target window will contain.

The derived class must provide the sizes for all rows and columns with indices up to the ones given here in it's OnGetRowHeight() and OnGetColumnWidth() implementations, respectively.

See also
  GetRowColumnCount()

## ◆ VirtualHitTest() [1/2]

wxPosition wxVarHVScrollHelper::VirtualHitTest | ( | const wxPoint & | pos | ) | const

Returns the virtual scroll unit under the device unit given accounting for scroll position or `wxNOT_FOUND` (for the row, column, or possibly both values) if none.

## ◆ VirtualHitTest() [2/2]

wxPosition wxVarHVScrollHelper::VirtualHitTest | ( | wxCoord | x,
|  | wxCoord | y
| ) |  | const

Returns the virtual scroll unit under the device unit given accounting for scroll position or `wxNOT_FOUND` (for the row, column, or possibly both values) if none.