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Listing 6.7 msg.css
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.msg_small_icon{ height: 32px; width: 32px; position:relative; float:left; } .msg_dialog_icon{ height: 32px; width: 32px; position:relative; float:right; } .msg_large_icon{ height: 64px; width: 64px; } .msg_text{ font-family: arial; font-weight: light; font-size: 14pt; color: blue; }
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The user experience
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.msgbar{ position:relative; background-color: white; border: solid blue 1px; width: 100%; height: 38px; padding: 2px; } .dialog{ position: absolute; background-color: white; border: solid blue 1px; width: 420px; top: 64px; left: 64px; padding: 4px; } .popup{ position: absolute; background-color: white; border: solid blue 1px; padding: 4px; } .non-modal{ } .modal{ position: absolute; top: 0px; left: 0px; width: 100%; height: 100%; background-image:url(img/modal_overlay.gif); }
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It s worth noting the use of the CSS float attribute in the msg_small_icon and msg_dialog_icon classes, which are used to render the icons in the status bar. msg_small_icon, which renders the icons for low-priority messages that present the tooltips, uses a left float to align them to the left edge, and msg_dialog_icon uses a right float to align the icon that launches the dialog to the right edge. The framework allows the status bar to be rendered in any shape or size of DIV element. Floating elements will align themselves in a sensible fashion, wrapping into vertically aligned bars, if needed (figure 6.5).
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Implementing a notification framework
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Figure 6.5 Using CSS float attributes allows a list of icons to fit into a variety of shapes of container. Here we have changed the status bar to a square, and the cross and blue sphere icons on the left wrap themselves into the new area automatically, while the launcher for the dialog floats to the right.
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Finally, we need to modify our Message object now that we have a user interface for it. As individual messages are created, they have the ability to add themselves to the user interface and will remove themselves when the message expires. Listing 6.8 presents the changes needed to implement this functionality.
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Listing 6.8 Modified Message object
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var msg=new Object(); msg.PRIORITY_LOW= { id:1, lifetime:30, icon:"img/msg_lo.png" }; msg.PRIORITY_DEFAULT={ id:2, lifetime:60, icon:"img/msg_def.png" }; msg.PRIORITY_HIGH= { id:3, lifetime:-1, icon:"img/msg_hi.png" }; msg.messages=new Array(); msg.dialog=null; msg.msgBarDiv=null; msg.suppressRender=false; msg.Message=function(id,message,priority,lifetime,icon){ this.id=id; msg.messages[id]=this; this.message=message; this.priority=(priority) priority : msg.PRIORITY_DEFAULT.id; this.lifetime=(lifetime) lifetime : this.defaultLifetime(); this.icon=(icon) icon : this.defaultIcon(); if (this.lifetime>0){ this.fader=setTimeout( "msg.messages['"+this.id+"'].clear()", this.lifetime*1000 ); } if (!msg.suppressRender){ Extra arguments this.attachToBar(); } }
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msg.Message.prototype.attachToBar=function(){ if (!msg.msgbarDiv){ msg.render();
Extra arguments
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}else if (this.priority==msg.PRIORITY_LOW.id){ this.render(msg.msgbarDiv); }else{ if (!msg.dialog){ msg.dialog=msg.createDialog( msg.msgbarDiv.id+"_dialog", msg.msgbarDiv, (this.priority==msg.PRIORITY_HIGH.id) ); } this.render(msg.dialog.tbod); msg.showDialog(); } } msg.Message.prototype.clear=function(){ msg.messages[this.id]=null; if (this.row){ this.row.style.display='none'; this.row.messageObj=null; this.row=null; } if (this.icoTd){ this.icoTd.style.display='none'; this.icoTd.messageObj=null; this.icoTd=null; } }
Extra arguments
We want the framework to be easy for developers to work with, so when a message is created, we automatically attach it to the user interface b. Simply invoking the constructor will cause the new message to render itself. Depending on the message priority, it will attach itself to the status bar or dialog as appropriate c. For cases where we don t want the overhead of rendering for each message such as when adding several messages at once we provide a flag to suppress automatic rendering. In such cases, we can manually call msg.render() after creating a large number of messages. Likewise, when removing a message in the clear() function, we automatically remove any user interface elements, so that the message goes away d. We now have a useful framework for presenting notifications to the user. We can trigger it manually but also make use of it in our other reusable code components. In the following section, we demonstrate how to hook it up to our ContentLoader object to report on the progress of network downloads.
Using the framework with network requests
6.5 Using the framework with network requests
In chapter 5 we introduced the ContentLoader object as a common encapsulation for network traffic. We can make use of our notification framework to provide status reports on any data request that we make automatically. Let s scope out the requirements first. When a request is made to the server, we would like to indicate that it is in progress, with a low-priority notification. To differentiate network requests from other low-level notifications, we would like to use a different icon. We have the image of the earth from our planetary viewer example in chapters 4 and 5, so let s use that. When the network request completes, we would like the notification to be cleared and replaced by a low-level notification if everything went okay or by a medium-level notification if there was an error. To implement this, we simply need to create Message objects at appropriate points in the lifecycle of the request, such as when the request is fired, when it completes or errors, and so on. The modified code for our ContentLoader object is given in listing 6.9.
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