Gsp5 toolbox picture8/19/2023 Here's an example that shows what takes place: Instead, they are applied in the InitializeComponent() method using the SetKeyName() method. The image key isn't actually stored in the resource file that contains the pictures. If you change the picture, you need to remove the image and add it back again (or use resources, which are discussed later in this chapter). Instead, it uses the embedded binary resource. However, at no point will your application use the original file. Initially, the name is set to match the file name of the original image. = (() (resources.GetObject("imagesLarge.ImageStream"))) A special class, the ImageListStreamer, makes this process a simple one-line affair, regardless of how many images are in your ImageList: This takes place in the InitializeComponent() helper method that's hidden in the designer file for your form. When the form is created, the images are deserialized into Image objects and placed in the collection. If you look at the automatically generated code for your form, you'll see that the image files you add are stored in a resource file in your project. Individual items in the control (like tree nodes or list rows) then use an ImageIndex property, which identifies a single picture in the ImageList by index number (starting at 0) or an ImageKey property, which identifies a single picture by its string name. Many modern controls provide an ImageList property, which stores a reference to an ImageList control. Once you have images in an ImageList control, you can use them to provide pictures to another control. When you add a picture, some related read-only properties about its size and format appear in the window (see Figure 5-2). Images can be drawn from almost any common bitmap file, including bitmaps, GIFs, JPEGs, and icons. Just click the ellipsis (.) next to the Images property in the Properties window. You can add, remove, and rearrange images using the ImageList designer. You also run into problems if the icon can be selected, at which point it is highlighted with a blue background. If you simply use an icon with a gray background, your interface becomes garish and ugly on a computer where the default color scheme is not used, as a gray box appears around the image. ■Tip Transparent regions are a must when mixing custom images and standard controls. This is useful for graphic formats that don't directly support transparency, like bitmaps.ĭraw() This overloaded method provides a quick and easy way to take an image and output it to a GDI+ drawing surface. By setting the TransparentColor property, you can define a new transparent color that will be used when this image is displayed. TransparentColor Some image types, like icons and GIFs, define a transparent color that allows the background to show through. Images are converted to the specified format when they are added. ImageList controls should contain only images that share the same size and color depth. ImageSize A Size structure that defines the size of the contained images (with a maximum of 256 x 256 pixels). Images The collection of Image objects that are provided to other controls. Some common choices are 5-bit (256-color mode), 16-bit (high color), and 24-bit (true color). ImageList Members Member DescriptionĬolorDepth A value from the ColorDepth enumeration that identifies the color resolution of the images in the control. The basic members of the ImageList are described in Table 5-2. To create an ImageList at design time, drag it onto your form (it will appear in the component tray). In this way, an ImageList acts as a resource for other controls, providing icons for controls like the ToolStrip and TreeView. Other controls access pictures in the ImageList using the appropriate index numbers or string key names. The ImageList component is a collection that holds images of a preset size and color depth.
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