wxWidgets: wxWithImages Class Reference

| Version: 3.2.2

Public Types | Public Member Functions | Protected Member Functions | List of all members
wxWithImages Class Reference

`#include <wx/withimages.h>`

Inheritance diagram for wxWithImages:
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## Detailed Description

A mixin class to be used with other classes that use a wxImageList.

This class is used by classes such as wxNotebook and wxTreeCtrl, that use image indices to specify the icons used for their items (page icons for the former or the items inside the control for the latter).

The icon index can either be a special value NO_IMAGE to indicate that an item doesn't use an image at all or a small positive integer to specify the index of the icon in the list of images maintained by this class. Note that for many controls, either none of the items should have an icon or all of them should have one, i.e. mixing the items with and without an icon doesn't always work well and may result in less than ideal appearance.

To initialize the list of icons used, call SetImages() method passing it a vector of wxBitmapBundle objects which can, in the simplest case, be just wxBitmap or wxIcon objects – however, as always with wxBitmapBundle, either more than one bitmap or icon needs to be specified or the bitmap bundle needs to be created from SVG to obtain better appearance in high DPI.

Alternative, traditional API which was the only one available until wxWidgets 3.1.6, is based on the use of wxImageList class. To use it, you need to create an object of this class and then call either AssignImageList() to set this image list and give the control its ownership or SetImageList() to retain the ownership of the image list, which can be useful if the same image list is shared by multiple controls, but requires deleting the image list later.

Note
  wxImageList-based API is not formally deprecated, but its use is discouraged because it is more complicated than simply providing a vector of bitmaps and it doesn't allow specifying multiple images or using SVG, which is required for good high DPI support. Please don't use AssignImageList() and SetImageList() in the new code and use SetImages() instead.

## Public Types
enum | { NO_IMAGE = -1 }

## Public Member Functions
| wxWithImages ()
virtual | ~wxWithImages ()
int | GetImageCount () const
| Return the number of images in this control. More...
bool | HasImages () const
| Return true if the control has any images associated with it. More...
void | SetImages (const wxVector< wxBitmapBundle > &images)
| Set the images to use for the items in the control. More...
void | AssignImageList (wxImageList *imageList)
| Sets the image list for the page control and takes ownership of the list. More...
virtual void | SetImageList (wxImageList *imageList)
| Sets the image list to use. More...
wxImageList * | GetImageList () const
| Returns the associated image list, may be NULL. More...
wxImageList * | GetUpdatedImageListFor (wxWindow *win)
| Returns the image list updated to reflect the DPI scaling used for the given window if possible. More...

## Protected Member Functions
bool | HasImageList () const
| Return true if we have a valid image list. More...
wxIcon | GetImage (int iconIndex) const
| Return the image with the given index from the image list. More...

## Member Enumeration Documentation

## ◆ anonymous enum

anonymous enum

Enumerator
NO_IMAGE |

## Constructor & Destructor Documentation

## ◆ wxWithImages()

wxWithImages::wxWithImages | ( |  | ) |

## ◆ ~wxWithImages()

virtual wxWithImages::~wxWithImages | ( |  | ) |
| virtual

## Member Function Documentation

## ◆ AssignImageList()

void wxWithImages::AssignImageList | ( | wxImageList * | imageList | ) |

Sets the image list for the page control and takes ownership of the list.

This function exists for compatibility only, please use SetImages() in the new code.

See also
  wxImageList, SetImageList()

## ◆ GetImage()

wxIcon wxWithImages::GetImage | ( | int | iconIndex | ) | const
| protected

Return the image with the given index from the image list.

If there is no image list or if index == NO_IMAGE, silently returns wxNullIcon.

## ◆ GetImageCount()

int wxWithImages::GetImageCount | ( |  | ) | const

Return the number of images in this control.

The returned value may be 0 if there are no images associated with the control.

See also
  HasImages()

Since
  3.1.6

## ◆ GetImageList()

wxImageList* wxWithImages::GetImageList | ( |  | ) | const

Returns the associated image list, may be NULL.

Note that the new code should use GetUpdatedImageListFor() instead.

See also
  wxImageList, SetImageList()

## ◆ GetUpdatedImageListFor()

wxImageList* wxWithImages::GetUpdatedImageListFor | ( | wxWindow * | win | ) |

Returns the image list updated to reflect the DPI scaling used for the given window if possible.

If SetImages() has been called, this function creates the image list containing the images using the DPI scaling in effect for the provided win, which must be valid.

Otherwise it behaves as GetImageList(), i.e. returns the image list previously set using SetImageList() or AssignImageList(), and just returns NULL if none of them had been called.

Returns
  Possibly null pointer owned by this object, i.e. which must not be deleted by the caller.

Since
  3.1.6

## ◆ HasImageList()

bool wxWithImages::HasImageList | ( |  | ) | const
| protected

Return true if we have a valid image list.

## ◆ HasImages()

bool wxWithImages::HasImages | ( |  | ) | const

Return true if the control has any images associated with it.

See also
  GetImageCount()

Since
  3.1.6

## ◆ SetImageList()

virtual void wxWithImages::SetImageList | ( | wxImageList * | imageList | ) |
| virtual

Sets the image list to use.

It does not take ownership of the image list, you must delete it yourself.

This function exists for compatibility only, please use SetImages() in the new code.

See also
  wxImageList, AssignImageList()

## ◆ SetImages()

void wxWithImages::SetImages | ( | const wxVector< wxBitmapBundle > & | images | ) |

Set the images to use for the items in the control.

This function allows to specify the images to use in multiple different resolutions, letting the control to select the appropriate one for its DPI scaling. For this reason, it should be preferred to using the functions taking wxImageList, which has a fixed size, in the new code.

Parameters

  images | Non empty vector of bitmap bundles. Valid image indexes for the items in this control are determined by the size of this vector.

Since
  3.1.6