mirror of
https://github.com/netsurf-browser/netsurf
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53 lines
2.0 KiB
Plaintext
53 lines
2.0 KiB
Plaintext
Frames
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======
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Frames cut across many parts of the browser.
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Representation in content
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-------------------------
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During box-tree construction (box_construct.c), frameset, frame, and iframe
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elements are converted into structures in the 'struct content' for the HTML
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document.
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Framesets and frames form a tree of 'struct content_html_frames' at
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content->data.html.frameset. For example, the source
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<frameset rows="50%,50%">
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<frameset cols="40,200">
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<frame name="A" src="aaa">
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<frame name="B" src="bbb">
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</frameset>
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<frameset cols="3*,*">
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<frame name="C" src="ccc">
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<frame name="D" src="ddd">
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</frameset>
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</frameset>
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results in the tree
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0x6099f2f4 (2 1) w0px h0px (margin w0 h0) (scrolling no)
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(0 0): 0x608b730c (1 2) w100% h50% (margin w0 h0) (scrolling no)
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(0 0): 0x608dae74 (0 0) w40px h100% (margin w0 h0) 'A' <aaa> (scrolling auto) border 0
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(0 1): 0x608daeb0 (0 0) w200px h100% (margin w0 h0) 'B' <bbb> (scrolling auto) border 0
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(1 0): 0x608b7348 (1 2) w100% h50% (margin w0 h0) (scrolling no)
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(0 0): 0x608d9b4c (0 0) w3* h100% (margin w0 h0) 'C' <ccc> (scrolling auto) border 0
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(0 1): 0x608d9b88 (0 0) w1* h100% (margin w0 h0) 'D' <ddd> (scrolling auto) border 0
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(output from html_dump_frameset()).
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Creation of browser windows
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---------------------------
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When a document containing frames is displayed in a browser window, child
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windows are created for frames and iframes. This occurs when a browser window
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receives a CONTENT_MSG_READY in browser_window_callback(), which calls
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browser_window_create_frameset().
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browser_window_create_frameset() constructs a tree of 'struct browser_window'
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corresponding to the tree of 'struct content_html_frames'. For each new
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browser_window, it calls gui_create_browser_window() to create and open the
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actual platform-specific window (represented by a 'struct gui_window').
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When this is completed it calls browser_window_recalculate_frameset() which
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calculates the positions of each frame in pixels and calls
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gui_window_position_frame() to position each one.
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