635ebf4a4e
git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@995 8e941d3f-bd1b-0410-a28a-d453659cc2b4
160 lines
7.3 KiB
HTML
160 lines
7.3 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Things You Should Know</TITLE>
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<LINK REL="stylesheet" TYPE="text/css" HREF="demo.css">
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<STYLE TYPE="text/css"> <!--
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.indent1 {Margin-left: 35px;}
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-->
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</STYLE>
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</HEAD>
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<BODY CLASS="indent">
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<P CLASS="title">Things You Should Know</P>
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<TABLE ALIGN="center" BORDER="0">
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<TR>
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<TD> <UL>
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<LI><A HREF="#Difference">TFrameViewer, ThtmlViewer, and TFrameBrowser</A> </LI>
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<LI><A HREF="#PNGSupport">PNG Image Support</A></LI>
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<LI><A HREF="#CompileOptions">Version 9.45 Compile Time Options</A> </LI>
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<LI><A HREF="#ActiveImages">Mouseover Images</A> </LI>
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<LI><A HREF="#HeadFoot">Printing Table Headers and Footers</A>
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</UL>
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</TD>
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<TD WIDTH="30"> </TD>
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</TR>
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</TABLE>
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<p CLASS="heading"><A NAME="Difference">TFrameViewer, ThtmlViewer, and TFrameBrowser</A></p>
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<P>The HTML component set consists of the <B>ThtmlViewer</B>, <B>TFrameViewer</B>, and <B>TFrameBrowser</B>
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components. All three are HTML document display components:</P>
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<TABLE WIDTH="100%" CELLSPACING="2" CELLPADDING="2" BORDER="0">
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<TR>
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<TH WIDTH="2%"></TH>
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<TH CLASS="maroon" VALIGN="top" ALIGN="left">ThtmlViewer</TH>
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<TD VALIGN="top">The basic component. <B>ThtmlViewer</B> displays single (non-frame) documents. It also forms
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the basis for the other two components.<BR>
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<BR>
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</TD>
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</TR>
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<TR>
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<TD></TD>
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<TH CLASS="maroon" VALIGN="top" ALIGN="left">TFrameViewer</TH>
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<TD VALIGN="top">Displays both Frame and single HTML documents. <B>TFrameViewer</B> is oriented more for local
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disk file use.<BR>
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<BR>
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</TD>
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</TR>
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<TR>
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<TH></TH>
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<TH CLASS="maroon" VALIGN="top" ALIGN="left">TFrameBrowser </TH>
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<TD VALIGN="top">Also displays Frame and single HTML documents. However, <B>TFrameBrower</B> is oriented
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toward Internet style protocols and URL usage. Additional code and/or components are generally required to use
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<B>TFrameBrowser</B>.<BR>
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</TD>
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</TR>
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</TABLE>
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<P> If you know that your appication will not be using Frames, you can save a fair amount of code overhead by
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using <B>ThtmlViewer</B> rather than one of the Frame components. Many operations are also simpler using
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<B>ThtmlViewer</B>. </P>
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<p CLASS="heading"><A NAME="PNGSupport">PNG Image Support</A></p>
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<p>Starting with version 9.4, the HTML Components will use the <code>GDIPLUS.DLL</code> for displaying
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PNG images if that DLL is present. This will allow proper rendering of PNG images with
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Alpha transparency. If the <code>GDIPLUS.DLL</code> is not present, PNG images will still be displayed
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but without the Alpha transparency capability.
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<p>The <code>GDIPLUS.DLL</code> is present on all WinXP systems and has often been loaded on other systems
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by other applications. If it is not present on your system, it can be downloaded
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(at no charge) <a href="http://www.microsoft.com/downloads/details.aspx?familyid=6A63AB9C-DF12-4D41-933C-BE590FEAA05A&displaylang=en">here</a>.
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<p CLASS="heading"><A NAME="CompileOptions">Version 9.45 Compile Time Options</A></p>
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<P>Version 9.45 has several possible compile time options controlled by defining symbols. You can find these in the
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<CODE>HTMLCONS.INC</CODE> file. None of these symbols are initially defined. To make any one (or all) of these
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symbols active, remove the "<B>.</B>" from the <CODE>{$.Define XXXX}</CODE> sequence and recompile the
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code. </P>
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<P> The possibilities are: </P>
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<P CLASS="maroon">NoOldPNG</P>
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<P CLASS="indent1">Defining <B>NoOldPNG</B> removes the backup PNG Image code. This option
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should not be used unless it is certain that the <code>GDIPLUS.DLL</code> is present or if PNG image
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capabilies are not required.
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</B></P>
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<P CLASS="maroon">NoGDIPlus</P>
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<P CLASS="indent1">The gdiplus.dll provides alpha transparency support for
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PNG images. If, for some reason the use of the gdiplus.dll is
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undesirable, define <b>NoGDIPlus</b>
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</B></P>
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<P CLASS="maroon">NoTabLink</P>
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<P CLASS="indent1">Defining <B>NoTabLink</B> disables the ability to Tab between
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Links. This may be desirable for documents with a great many links.
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</B></P>
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<P CLASS="maroon">Quirk</P>
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<P CLASS="indent1">Defining <B>Quirk</B> makes changes which simulate some of the
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quirks of other browsers. It may be desirable to define this constant
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if you expect to be displaying HTML which might depend on these quirks.
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Currently, <B>Quirk</B> forces the font color and size to return to default
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values in each table cell.
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</B></P>
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<P CLASS="maroon">UseTNT or UseElpack</P>
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<P CLASS="indent1">Defining one of these allows the Unicode TNT or Elpack
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controls to be substituted for Delphi controls for Form controls.
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See the file, htmlcons.inc, for more details.
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</B></P>
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<P CLASS="maroon">NoMetafile</P>
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<P CLASS="indent1">Metafiles may be displayed by undefining this constant.
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NoMetaFile is defined by default to emphasize the fact that Metafile
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display and some printing operations are currently incompatible in Win98.
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For applications where printing is unimportant or Win98/95/ME need not
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be supported, undefining this constant will allow Metafiles to be
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displayed.
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</B></P>
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<P CLASS="maroon"><a name="OpOnChange">OpOnChange</a></P>
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<P CLASS="indent1">Without this definition, the <select> form controls (TListbox and
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TCombobox) will issue the OnObjectChange event only when the control
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loses the focus which is according to HTML specs. Defining OpOnChange
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simulates the way IExplorer does it, issuing the OnChange event
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immediately when a change is made.
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</B></P>
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<p CLASS="heading"><A NAME="ActiveImages">Mouseover Images</A></p>
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<P>A<I><B> Mouseover Image</B></I> is one that changes when the mouse passes over it. The HTML components use a
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special syntax to implement mouseover images. It's done with the <B><img></B> tag as follows: </P>
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<UL>
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<LI>the <B>SRC="..."</B> attribute should specify an animated GIF image </LI>
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<LI>Add an <B>Active</B> attribute </LI>
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</UL>
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<P> With the <B>Active</B> attribute, the GIF will normally just display the first frame. When the mouse passes
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over, it will display the second frame and when left clicked will show the
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third frame. If there are more than 3 frames, the GIF will animate when the
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mouse passes over. </P>
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<p CLASS="heading"><A NAME="HeadFoot">Printing Table Headers and Footers</A></p>
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<P>Starting with Version 9.3, <B><thead></B>, <B><tbody></B>, and <B><tfoot></B>
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are supported when printing with some restrictions. In a table
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definition, these tags define header, body, and footer sections of the table.
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If the table is split between pages when printing, the table portion on each
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page will have its own header and footer section.</p>
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<p>For best results, note the following hints and restrictions.
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<ul>
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<li>Only the outer table will have headers and footers. Nested tables are
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unaffected.
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<li>When practical, use the style
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<p style="margin:5; margin-left: 30;">
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<code>tr {page-break-inside: avoid;}</code></p>
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<p style="margin-top:5;">to avoid splitting rows at page boundaries.
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<li>Table are pieced together when printing. Avoid table background
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images which may not match between sections. Table background colors are
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unaffected.
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<li>When using Print Preview to inspect page layout, use the 100% magnification
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setting for best accuracy.
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</ul>
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</BODY>
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</HTML>
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