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The Explorer Bar was introduced with Microsoft Internet Explorer 4.0 to provide a display area adjacent to the browser pane. It is basically a child window within the Windows Internet Explorer window, and it can be used to display information and interact with the user in much the same way. Explorer Bars are most commonly displayed as a vertical pane on the left side of the browser pane. However, an Explorer Bar can also be displayed horizontally, below the browser pane.
There is a wide range of possible uses for the Explorer Bar. Users can select which option they want to see in several different ways, including selecting it from the Explorer Bar submenu of the View menu, or clicking a toolbar button. Internet Explorer provides several standard Explorer Bars, including Favorites and Search.
One of the ways you can customize Internet Explorer is by adding a custom Explorer Bar. When implemented and registered, it will be added to the Explorer Bar submenu of the View menu. When selected by the user, the Explorer Bar's display area can then be used to display information and take user input in much the same way as a normal window.
To create a custom Explorer Bar, you must implement and register a band object. Band objects were introduced with version 4.71 of the Shell and provide capabilities similar to those of normal windows. However, because they are Component Object Model (COM) objects and contained by either Internet Explorer or the Shell, they are implemented somewhat differently. Simple band objects were used to create the sample Explorer Bars displayed in the first graphic. The implementation of the vertical Explorer Bar sample will be discussed in detail in a later section.
A tool band is a band object that was introduced with Microsoft Internet Explorer 5 to support the Windows radio toolbar feature. The Internet Explorer toolbar is actually a rebar control that contains several toolbar controls. By creating a tool band, you can add a band to that rebar control. However, like Explorer Bars, a tool band is a general purpose window.
Band objects can also be used to create desk bands. While their basic implementation is similar to Explorer Bars, desk bands are unrelated to Internet Explorer. A desk band is basically a way to create a dockable window on the desktop. The user selects it by right-clicking the taskbar and selecting it from the Toolbars submenu.
Although they can be used much like normal windows, band objects are COM objects that exist within a container. Explorer Bars are contained by Internet Explorer, and desk bands are contained by the Shell. While they serve different functions, their basic implementation is very similar. The primary difference is in how the band object is registered, which in turn controls the type of object and its container. This section discusses those aspects of implementation that are common to all band objects. See A Simple Example of a Custom Explorer Bar for additional implementation details.
In addition to registering their class identifier (CLSID), the Explorer Bar and desk band objects must also be registered for the appropriate component category. Registering the component category determines the object type and its container. Tool bands use a different registration procedure and do not have a category identifier (CATID). The CATIDs for the three band objects that require them are:
If the band object is to accept user input, it must also implement IInputObject. To add items to the shortcut menu for Explorer Bar or desk bands, the band object must export IContextMenu. Tool bands do not support shortcut menus.
Band objects can send commands to their container through the container's IOleCommandTarget interface. To obtain the interface pointer, call the container's IInputObjectSite::QueryInterface method and ask for IID_IOleCommandTarget. You then send commands to the container with IOleCommandTarget::Exec. The command group is CGID_DeskBand. When a band object's IDeskBand::GetBandInfo method is called, the container uses the dwBandID parameter to assign the band object an identifier that is used for three of the commands. Four IOleCommandTarget::Exec command IDs are supported.
The band's information has changed. Set the pvaIn parameter to the band identifier that was received in the most recent call to IDeskBand::GetBandInfo. The container will call the band object's IDeskBand::GetBandInfo method to request the updated information.
Version 5. Display a chevron menu. The container sends an RB_PUSHCHEVRON message, and the band object receives an RBN_CHEVRONPUSHED notification that prompts it to display the chevron menu. Set the IOleCommandTarget::Exec method's nCmdExecOpt parameter to the band identifier received in the most recent call to IDeskBand::GetBandInfo. Set the IOleCommandTarget::Exec method's pvaIn parameter to the VT_I4 type with an application-defined value. It passes back to the band object as the lAppValue value of the RBN_CHEVRONPUSHED notification.
A band object must be registered as an OLE in-process server that supports apartment threading. The default value for the server is a menu text string. For Explorer Bars, it will appear in the Explorer Bar submenu of the Internet Explorer View menu. For tool bands, it will appear in the Toolbars submenu of the Internet Explorer View menu. For desk bands, it will appear in the Toolbars submenu of the taskbar's shortcut menu. As with menu resources, placing an ampersand (&) in front of a letter will cause it to be underlined and enable keyboard shortcuts. For example, the menu string for the vertical Explorer Bar shown in the first graphic is "Sample &Vertical Explorer Bar".
Initially, Internet Explorer retrieves an enumeration of the registered Explorer Bar objects from the registry using the component categories. To increase performance, it then caches this enumeration, causing subsequently added Explorer Bars to be overlooked. To force Windows Internet Explorer to rebuild the cache and recognize a new Explorer Bar, delete the following registry keys during the registration of the new Explorer Bar:
There are several optional values that can also be added to the registry. For instance, the following value is necessary if you want to use the Explorer Bar to display HTML The value shown is not an example, but the actual value that should be used.
Used in conjunction with the value shown above, the following optional value is also necessary if you want to use the Explorer Bar to display HTML. This value should be set to the location of the file that contains the HTML content for the Explorer Bar.
The BarSize value should be set to the width or height of the bar. The value requires eight bytes and is placed in the registry as a binary value. The first four bytes specify the size in pixels, in hexadecimal format, starting from the leftmost byte. The last four bytes are reserved and should be set to zero.
You can handle registration of a band object's CATID programmatically. Create a component categories manager object (CLSID_StdComponentCategoriesMgr) and request a pointer to its ICatRegister interface. Pass the band object's CLSID and CATID to ICatRegister::RegisterClassImplCategories.
The very simple implementation used in the Explorer Bar sample could actually be used for either type of Explorer Bar, or a desk band, by simply registering it for the appropriate component category. More sophisticated implementations will need to be customized for each object type's display region and container. However, much of this customization can be accomplished by taking the sample code and extending it by applying familiar Windows programming techniques to the child window. For example, you can add controls for user interaction, or graphics for a richer display.
When the user selects an Explorer Bar, the container calls the corresponding band object's IObjectWithSite::SetSite method. The punkSite parameter will be set to the site's IUnknown pointer.
The Explorer Bar sample implements SetSite in the following way. In the following code m_pSite is a private member variable that holds the IInputObjectSite pointer and m_hwndParent holds the parent window's handle. In this sample, window creation is also handled. If the window does not exist, this method creates the Explorer Bar's window as an appropriately sized child of the parent window obtained by SetSite. The child window's handle is stored in m_hwnd.
Internet Explorer will call the Explorer Bar's IPersistStream interface to allow the Explorer Bar to load or save persistent data. If there is no persistent data, the methods must still return a success code. The IPersistStream interface inherits from IPersist, so five methods must be implemented.
The Explorer Bar sample does not use any persistent data and has only a minimal implementation of IPersistStream. IPersist::GetClassID returns the object's CLSID (CLSID_SampleExplorerBar), and the remainder return either S_OK, S_FALSE, or E_NOTIMPL.
The ResizeBorderDW method is not used with any type of band object and should always return E_NOTIMPL. The ShowDW method either shows or hides the Explorer Bar's window, depending on the value of its parameter.
The remaining method, GetBandInfo, is specific to IDeskBand. Internet Explorer uses it to specify the Explorer Bar's identifier and viewing mode. Internet Explorer also may request one or more pieces of information from the Explorer Bar by filling the dwMask member of the DESKBANDINFO structure that is passed as the third parameter. GetBandInfo should store the identifier and viewing mode and fill the DESKBANDINFO structure with the requested data. The Explorer Bar sample implements GetBandInfo as shown in the following code example.
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