xtd::forms::image_list Class Reference

Inheritance diagram for xtd::forms::image_list:

Definition

Provides methods to manage a collection of xtd::drawing::image objects. This class cannot be inherited.

Header

#include <xtd/forms/image_list>

Namespace

xtd::forms

Library

xtd.forms

Remarks

image_list is typically used by other controls, such as the list_view, tree_view, or tool_bar. You can add bitmaps or icons to the image_list, and the other controls are able to use the images as they require.

image_list uses a handle to manage the list of images. The handle is not created until certain operations, such as getting the handle or calling draw, are performed on the image list. Performing other operations, such as setting the color_depth or image_size will cause the handle to be recreated. Therefore, you should perform these operations before you add images to the image_list.

Examples

The following code example demonstrates the use of image_list class.

#include <xtd/forms/application>
#include <xtd/forms/button>
#include <xtd/forms/button_images>
#include <xtd/forms/form>
#include <xtd/forms/open_file_dialog>
#include <xtd/forms/picture_box>
#include <xtd/drawing/system_colors>
 
using namespace xtd;
using namespace xtd::drawing;
using namespace xtd::forms;
 
namespace example {
  class form1 : public form {
  public:
    form1() {
      text("Image list example");
      client_size({300, 250});
      controls().push_back_range({picture, button_previous, button_next});
      
      pictures.image_size({128, 128});
      
      picture.back_color(system_colors::window());
      picture.border_style(forms::border_style::fixed_3d);
      picture.bounds({75, 25, 150, 150});
      picture.size_mode(picture_box_size_mode::center_image);
      picture.click += [&] {
        load_images();
      };
      
      button_previous.auto_repeat(true);
      button_previous.image(button_images::previous());
      button_previous.location({75, 200});
      button_previous.enabled(false);
      button_previous.click += [&] {
        if (current_image_index > 0) picture.image(pictures.images()[--current_image_index]);
        button_previous.enabled(current_image_index > 0);
        button_next.enabled(current_image_index < pictures.images().size() - 1);
      };
      
      button_next.auto_repeat(true);
      button_next.image(button_images::next());
      button_next.location({150, 200});
      button_next.enabled(false);
      button_next.click += [&] {
        if (current_image_index < pictures.images().size()) picture.image(pictures.images()[++current_image_index]);
        button_previous.enabled(current_image_index > 0);
        button_next.enabled(current_image_index < pictures.images().size() - 1);
      };
      
      show();
      load_images();
    }
    
  private:
    void load_images() {
      auto dialog = open_file_dialog {};
      dialog.multiselect(true);
      dialog.filter("All Image Files|*.bmp;*.gif;*.jpg;*.jpeg;*.png;*.tif;*.tiff;*.xpm|Bitmap Files|*.bmp|Gif Files|*.gif|Jpeg Files|*.jpg;*.jpeg|Png Files|*.png|Tiff Files|*.tif;*.tiff|xpm Files|*.xpm");
      if (dialog.show_dialog() == dialog_result::ok) {
        pictures.images().clear();
        for (auto file : dialog.file_names())
          pictures.images().push_back(drawing::image::from_file(file));
        current_image_index = 0;
        picture.image(pictures.images()[current_image_index]);
        button_previous.enabled(current_image_index > 0);
        button_next.enabled(current_image_index < pictures.images().size() - 1);
      }
    }
    
    size_t current_image_index = 0;
    image_list pictures;
    picture_box picture;
    button button_previous;
    button button_next;
  };
}
 
auto main() -> int {
  application::run(example::form1 {});
}

Examples

colored_tab_pages.cpp, and image_list.cpp.

Public Aliases
using	image_collection = layout::arranged_element_collection< drawing::image >
	Encapsulates the collection of xtd::drawing::image objects in an image_list.

Public Fields
static image_list	empty
	Represents an image_list empty.
static constexpr xtd::size	npos

Public Constructors
	image_list ()
	Initialize a new instance ao image_list class.

Public Properties
intptr	handle () const noexcept
	Gets the handle of the image list object.
bool	handle_created () const noexcept
	Gets a value indicating whether the underlying Win32 handle has been created.
image_collection &	images ()
	Gets the xtd::forms::image_list::image_collection for this image list.
const image_collection &	images () const noexcept
	Gets the xtd::forms::image_list::image_collection for this image list.
const drawing::size	image_size () const noexcept
	Gets the size of the images in the image list.
const image_list &	image_size (const drawing::size &value)
	Sets the size of the images in the image list.
std::any	tag () const noexcept
	Gets an object that contains additional data about the image_list.
image_list &	tag (const std::any &tag)
	Sets an object that contains additional data about the image_list.

Public Methods
bool	equals (const image_list &value) const noexcept override
virtual bool	equals (const object &obj) const noexcept
	Determines whether the specified object is equal to the current object.
template<typename object_a_t , typename object_b_t >
static bool	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are considered equal.

Additional Inherited Members
Public Member Functions inherited from xtd::object
	object ()=default
	Create a new instance of the ultimate base class object.
virtual size_t	get_hash_code () const noexcept
	Serves as a hash function for a particular type.
virtual type_object	get_type () const noexcept
	Gets the type of the current instance.
template<typename object_t >
xtd::uptr< object_t >	memberwise_clone () const
	Creates a shallow copy of the current object.
virtual xtd::string	to_string () const noexcept
	Returns a xtd::string that represents the current object.
Public Member Functions inherited from xtd::iequatable< image_list >
virtual bool	equals (const image_list &) const noexcept=0
	Indicates whether the current object is equal to another object of the same type.
Static Public Member Functions inherited from xtd::object
template<typename object_a_t , typename object_b_t >
static bool	equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are considered equal.
template<typename object_a_t , typename object_b_t >
static bool	reference_equals (const object_a_t &object_a, const object_b_t &object_b) noexcept
	Determines whether the specified object instances are the same instance.
Protected Member Functions inherited from xtd::forms::component
	component ()
	Initialises a new instance of the component class.
virtual bool	can_raise_events () const noexcept
	Gets a value indicating whether the component can raise an event.
bool	design_mode () const noexcept
	Gets a value that indicates whether the component is currently in design mode.

Member Typedef Documentation

image_collection

using xtd::forms::image_list::image_collection = layout::arranged_element_collection<drawing::image>

Encapsulates the collection of xtd::drawing::image objects in an image_list.

Constructor & Destructor Documentation

image_list()

xtd::forms::image_list::image_list

(

)

Initialize a new instance ao image_list class.

Member Function Documentation

handle()

intptr xtd::forms::image_list::handle ( ) const

noexcept

Gets the handle of the image list object.

Returns

The handle for the image list. The default is 0.

handle_created()

bool xtd::forms::image_list::handle_created ( ) const

noexcept

Gets a value indicating whether the underlying Win32 handle has been created.

Returns

true if the Handle has been created; otherwise, false. The default is false.

images() [1/2]

image_collection & xtd::forms::image_list::images

(

)

Gets the xtd::forms::image_list::image_collection for this image list.

Returns

The collection of images.

Remarks

If the image collection has not yet been created, it is created when you retrieve this property.

images() [2/2]

const image_collection & xtd::forms::image_list::images ( ) const

noexcept

Gets the xtd::forms::image_list::image_collection for this image list.

Returns

The collection of images.

Remarks

If the image collection has not yet been created, it is created when you retrieve this property.

image_size() [1/2]

const drawing::size xtd::forms::image_list::image_size ( ) const

noexcept

Gets the size of the images in the image list.

Returns

The xtd::drawing::size that defines the height and width, in pixels, of the images in the list. The default size is 16 by 16. The maximum size is 256 by 256.

image_size() [2/2]

const image_list & xtd::forms::image_list::image_size

(

const drawing::size &

value

)

Sets the size of the images in the image list.

Parameters

value

The xtd::drawing::size that defines the height and width, in pixels, of the images in the list. The default size is 16 by 16. The maximum size is 256 by 256.

Remarks

Setting the image_size property prior to adding images to the image collection causes the images to be resized to the image size specified.

When you set the image_size property to a new value, the handle for the image list is recreated.

Because setting the image_size property causes the handle to be recreated, you should set image_size prior to setting the Images property. When the handle for the image_list has been created, setting the color_depth or image_size properties in code, after setting the images property, will cause the collection of images set for the images property to be deleted.

tag() [1/2]

std::any xtd::forms::image_list::tag ( ) const

noexcept

Gets an object that contains additional data about the image_list.

Returns

A object that contains additional data about the image_list.

tag() [2/2]

image_list & xtd::forms::image_list::tag

(

const std::any &

tag

)

Sets an object that contains additional data about the image_list.

Parameters

tag	A object that contains additional data about the image_list.

equals() [1/2]

virtual bool xtd::object::equals ( const object &  obj ) const

virtualnoexcept

Determines whether the specified object is equal to the current object.

Parameters

obj	The object to compare with the current object.

Returns

true if the specified object is equal to the current object. otherwise, false.

Examples

The following code example compares the current instance with another object.

#include <xtd/console>
 
using namespace xtd;
 
auto main() -> int {
  auto object1 = new_ptr<object>();
  auto object2 = new_ptr<object>();
  
  auto object3 = object2;
  console::write_line(object1->equals(*object3));
  console::write_line(*object1 == *object3);
  object3 = object1;
  console::write_line(object1->equals(*object3));
  console::write_line(*object1 == *object3);
}
 
// This code produces the following output :
//
// false
// false
// true
// true

Reimplemented from xtd::object.

equals() [2/2]

template<typename object_a_t , typename object_b_t >

static bool xtd::object::equals ( const object_a_t &  object_a, const object_b_t &  object_b  )

inlinestaticnoexcept

Determines whether the specified object instances are considered equal.

Parameters

object_a	The first object to compare.
object_b	The second object to compare.

Returns

true if object_a is the same instance as object_b or if both are null references or if object_a(object_b) returns true. otherwise, false.

Examples

The following code example compares different objects.

#include <xtd/console>
 
using namespace xtd;
 
auto main() -> int {
  string s1 = "Tom";
  string s2 = "Carol";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "Tom";
  s2 = "Tom";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "";
  s2 = "Tom";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "Carol";
  s2 = "";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
  
  s1 = "";
  s2 = "";
  console::write_line("object::equals(\"{0}\", \"{1}\") => {2}", s1, s2, object::equals(s1, s2));
}
 
// This code produces the following output :
//
// object::equals("Tom", "Carol") => false
// object::equals("Tom", "Tom") => true
// object::equals("", "Tom") => false
// object::equals("Carol", "") => false
// object::equals("", "") => true

Member Data Documentation

empty

image_list xtd::forms::image_list::empty

static

Represents an image_list empty.

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The documentation for this class was generated from the following file:

• xtd.forms/include/xtd/forms/image_list.h