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The error message formatting might not be quite what you were after, so HTML Fill defines two special tags that can be used to customize how the error messages are displayed: <form:error name="field_name" format="formatter">: This tag is eliminated completely if there is no error for the named field. Otherwise, the error is passed through the given formatter ("default" if no format attribute is given). <form:iferror name="field_name">...</form:iferror>: If the named field doesn t have an error, everything between the tags will be eliminated. Use name="not field_name" to invert the behavior (in other words, include text only if there are no errors for the field). Formatters are functions that take the error text as a single argument and return a string that is inserted into the template. Formatters are specified as arguments to the htmlfill.render() function, which I will describe next. The default formatter returns the following: <span class="error-message">(message)</span><br> where (message) is replaced with the error message concerned. Most of the time it is best to use a formatter because the second form displays the static HTML you ve specified, not the actual error message generated. If any errors are generated for fields that don t exist, they are added at the top of the form.

The last part to add is the text below the shapes This is done by setting up a large font and then using it in a call to addText The addText works like drawText but allows the text to start only from a given point (that is, no texts contained in rectangles) This forms a whole bunch of closed regions that form the text: QFont font = QApplication::font(); fontsetPixelSize( 40 ); pathaddText( 20, 180, font, "Path" ); When the painter path is complete, all that s left to do is stroke it with a painter In the following code, you configure a pen and a brush for a painter Then the drawPath method is used to draw the actual painter path Figure 7-14 shows that when the regions overlap, the brush is not applied This makes it possible to create hollow paths by putting other paths inside them.

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Such a system log could even potentially be used as evidence in a court of law It is also crucial to make sure that when the logging is done and audit trails are kept, the logs cannot be deleted or modified after the fact For example, you would not want the CFO to be able to transfer money into her own personal account and then delete or change the audit trail so that transaction no longer appears, or is covered up in any way to appear as if the transaction had a different recipient To prevent logs from being deleted or altered, they could immediately be transferred to another system that hopefully an attacker would not be able to access as easily.

HTML Fill s render() function has the following arguments that you can use to customize how the form is rendered: def render(form, defaults=None, errors=None, use_all_keys=False, error_formatters=None, add_attributes=None, auto_insert_errors=True, auto_error_formatter=None, text_as_default=False, listener=None) It is important to note that HTML Fill s render() function has nothing to do with the render() function you ve been using to render templates; it is just unfortunate that both have the same name. The example so far has used the form, defaults and errors arguments, but other options can be useful too:

paintersetPen( Qt::black ); paintersetBrush( Qt::gray ); painterdrawPath( path ); Paths can consist of more shapes than the ones used in the preceding source code The following list mentions some of the methods that you can use to add shapes to your path: addEllipse: Adds an ellipse or circle addRect: Adds a rectangle addText: Adds text addPolygon: Adds a polygon When building a region from lines, arcs, and other components, the following methods can be useful: moveTo: Moves the current position lineTo: Draws a line to the next position arcTo: Draws an arc to the next position cubicTo: Draws a cubic Bezier curve (a smooth line) to the next point closeSubpath: Closes the current region by drawing a straight line from the current position to the starting point.

use_all_keys: If this is True, if there are any extra fields from defaults or errors that couldn t be used in the form, it will be an error. error_formatters: This is a dictionary of formatter names to one-argument functions that format an error into HTML. Some default formatters are provided if you don t provide this. add_attributes: This is a dictionary of field names to a dictionary of attribute name/values. If the name starts with +, then the value will be appended to any existing attribute (for example, {'+class': ' important'}). auto_insert_errors: If this is True (the default), then any errors for which <form:error> tags can t be found will be put just above the associated input field, or at the top of the form if no field can be found. auto_error_formatter: This is used to create the HTML that goes above the fields. By default, it wraps the error message in a span and adds a <br>. text_as_default: If this is True (the default is False), then <input type=unknown> will be treated as text inputs. listener: This can be an object that watches fields pass; the only one currently is in formencode.htmlfill_schemabuilder.SchemaBuilder.

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