the compiler failed with error code 128 asp.net THE TREE VIEW WIDGET in Font

Painting Data Matrix in Font THE TREE VIEW WIDGET

CHAPTER 8 THE TREE VIEW WIDGET
Print DataMatrix In None
Using Barcode creation for Font Control to generate, create ECC200 image in Font applications.
www.OnBarcode.com
Generating Data Matrix 2d Barcode In None
Using Barcode encoder for Font Control to generate, create Data Matrix 2d barcode image in Font applications.
www.OnBarcode.com
/* Add the tree model to the tree view and unreference it so that the model will * be destroyed along with the tree view. */ gtk_tree_view_set_model (GTK_TREE_VIEW (treeview), GTK_TREE_MODEL (store)); g_object_unref (store); scrolled_win = gtk_scrolled_window_new (NULL, NULL); gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC); gtk_container_add (GTK_CONTAINER (scrolled_win), treeview); gtk_container_add (GTK_CONTAINER (window), scrolled_win); gtk_widget_show_all (window); gtk_main (); return 0; } /* Add three columns to the GtkTreeView. All three of the columns will be * displayed as text, although one is a gboolean value and another is * an integer. */ static void setup_tree_view (GtkWidget *treeview) { GtkCellRenderer *renderer; GtkTreeViewColumn *column; /* Create a new GtkCellRendererText, add it to the tree view column and * append the column to the tree view. */ renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Buy", renderer, "text", BUY_IT, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Count", renderer, "text", QUANTITY, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); renderer = gtk_cell_renderer_text_new (); column = gtk_tree_view_column_new_with_attributes ("Product", renderer, "text", PRODUCT, NULL); gtk_tree_view_append_column (GTK_TREE_VIEW (treeview), column); }
Print GTIN - 13 In None
Using Barcode generation for Font Control to generate, create EAN / UCC - 13 image in Font applications.
www.OnBarcode.com
Make Barcode In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
CHAPTER 8 THE TREE VIEW WIDGET
Paint QR Code In None
Using Barcode generator for Font Control to generate, create QR-Code image in Font applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode creation for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Creating the Tree View
Code-39 Generation In None
Using Barcode creation for Font Control to generate, create ANSI/AIM Code 39 image in Font applications.
www.OnBarcode.com
USPS Confirm Service Barcode Printer In None
Using Barcode creation for Font Control to generate, create USPS PLANET Barcode image in Font applications.
www.OnBarcode.com
Creating the GtkTreeView widget is the easiest part of the process. You need only to call gtk_tree_view_new(). If you want to add the default tree model on initialization, you can use gtk_tree_view_new_with_model(), but a tree model can easily be applied to a GtkTreeView after initialization with gtk_tree_view_set_model(). The gtk_tree_view_new_with_model() function is simply a convenience function. There are many functions that allow you to customize a GtkTreeView to fit your needs. For example, above each GtkTreeViewColumn, a header label is rendered that tells the user more about the column contents. You can set gtk_tree_view_set_headers_visible() to FALSE in order to hide them. void gtk_tree_view_set_headers_visible (GtkTreeView *treeview, gboolean visible);
DataMatrix Generation In None
Using Barcode maker for Software Control to generate, create Data Matrix 2d barcode image in Software applications.
www.OnBarcode.com
Data Matrix Maker In None
Using Barcode generation for Excel Control to generate, create Data Matrix image in Excel applications.
www.OnBarcode.com
Note You should be careful when hiding tree view headers, because they help the user know the contents
Encoding Barcode In None
Using Barcode printer for Online Control to generate, create Barcode image in Online applications.
www.OnBarcode.com
Barcode Printer In Objective-C
Using Barcode drawer for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
of each column. They should only be hidden if there is no more than one column or the contents of each column are clearly explained in some other manner.
GS1-128 Creator In Objective-C
Using Barcode encoder for iPad Control to generate, create EAN128 image in iPad applications.
www.OnBarcode.com
Code 39 Full ASCII Creation In Java
Using Barcode maker for Android Control to generate, create Code-39 image in Android applications.
www.OnBarcode.com
GtkTreeViewColumn headers provide more functionality beyond column titles for some tree views. In sortable tree models, clicking the column header can initiate sorting of all of the rows according to the data held in the corresponding column. It also gives a visual indication of the sort order of the column if applicable. You should not hide the headers if the user will need them to sort the tree view rows. Another GtkTreeView function, gtk_tree_view_set_rules_hint() requests a GTK+ theme to differentiate between alternating rows. This is often done by changing the background color of adjacent rows. However, as the function name suggests, this property is only a hint for the theme engine and may not be honored. Also, some theme engines alternate background colors automatically regardless of this setting. void gtk_tree_view_set_rules_hint (GtkTreeView *treeview, gboolean alternate_colors); This property should only be used if it is a necessity. For example, if your tree view contains many rows, it could help the user navigate throughout its contents. In contrast, it should not be used for aesthetic purposes, because those settings should always be dictated by the user s theme. As a GTK+ developer, you should be very careful about changing visual properties. Users have the ability to choose themes that fit their needs, and you can make your application unusable by changing how widgets are displayed.
Creating PDF417 In None
Using Barcode generation for Software Control to generate, create PDF417 image in Software applications.
www.OnBarcode.com
Draw Barcode In .NET
Using Barcode encoder for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
CHAPTER 8 THE TREE VIEW WIDGET
Printing ANSI/AIM Code 39 In Java
Using Barcode creation for BIRT reports Control to generate, create Code 3 of 9 image in Eclipse BIRT applications.
www.OnBarcode.com
Print GS1 128 In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create USS-128 image in ASP.NET applications.
www.OnBarcode.com
Renderers and Columns
PDF 417 Reader In C#
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Printing QR Code ISO/IEC18004 In None
Using Barcode generator for Software Control to generate, create QR Code image in Software applications.
www.OnBarcode.com
After creating the GtkTreeView, you need to add one or more columns to the view for it to be of any use. Each GtkTreeViewColumn is composed of a header, which displays a short description of its content, and at least one cell renderer. Tree view columns do not actually render any content. Tree view columns hold one or more cell renderers that are used to draw the data on the screen. All cell renderers are derived from the GtkCellRenderer class and are referred to as objects in this chapter, because GtkCellRenderer is derived directly from GtkObject, not from GtkWidget. Each cell renderer contains a number of properties that determine how the data will be drawn within a cell. The GtkCellRenderer class provides common properties to all derivative renderers including background color, size parameters, alignments, visibility, sensitivity, and padding. A full list of GtkCellRenderer properties can be found in Appendix A. It also provides the editing-canceled and editing-started signals, which allow you to implement editing in custom cell renderers. In Listing 8-1, you were introduced to GtkCellRendererText, which is capable of rendering strings, numbers, and gboolean values as text. Textual cell renderers are initialized with gtk_cell_renderer_text_new(). GtkCellRendererText provides a number of additional properties that dictate how each cell will be rendered. You should always set the text property, which is the string that will be displayed in the cell. The rest of the properties are similar to those used with text tags. GtkCellRendererText contains a large number of properties that dictate how every row will be rendered. g_object_set() was used in the following example to set the foreground color of every piece of text in the renderer to orange. Some properties have a corresponding set property as well, which must be set to TRUE if you want the value to be used. For example, you should set foreground-set to TRUE for the changes will take effect. g_object_set (G_OBJECT (renderer), "foreground", "Orange", "foreground-set", TRUE, NULL); After you create a cell renderer, it needs to be added to a GtkTreeViewColumn. Tree view columns can be created with gtk_tree_view_column_new_with_attributes() if you only want the column to display one cell renderer. In the following code, a tree view column is created with the title Buy and a renderer with one attribute. This attribute will be referred to as BUY_IT when the GtkListStore is populated. column = gtk_tree_view_column_new_with_attributes ("Buy", renderer, "text", BUY_IT, NULL); The preceding function accepts a string to display in the column header, a cell renderer, and a NULL-terminated list of attributes. Each attribute contains a string that refers to the renderer property and the tree view column number. The important thing to realize is that the column number provided to gtk_tree_view_column_new_with_attributes() refers to the tree model column, which may not be the same as the number of tree model columns or cell renderers used by the tree view.
Copyright © OnBarcode.com . All rights reserved.