Preview Function API

Prototype for a Preview Function. More...

Collaboration diagram for Preview Function API:

Functions
static int	preview_page_up (struct PreviewWindowData *wdata, const struct KeyEvent *event)
	Show the previous page of the message - Implements preview_function_t -.
static int	preview_page_down (struct PreviewWindowData *wdata, const struct KeyEvent *event)
	Show the next page of the message - Implements preview_function_t -.

Detailed Description

Prototype for a Preview Function.

Parameters

wdata	Preview Window data
event	Event to process

Return values

enum	FunctionRetval

Precondition

wdata is not NULL

event is not NULL

Function Documentation

preview_page_up()

static int preview_page_up ( struct PreviewWindowData * wdata, const struct KeyEvent * event )

static

Show the previous page of the message - Implements preview_function_t -.

Definition at line 386 of file preview.c.

{
  if (wdata->scroll_offset <= 0)
  {
    if (event->count == 0)
      mutt_message(_("Top of message is shown"));
    return FR_NO_ACTION;
  }
 
  const int count = MAX(event->count, 1);
  const int page = MAX(wdata->win->state.rows - 1, 1);
  wdata->scroll_offset -= count * page;
  if (wdata->scroll_offset < 0)
    wdata->scroll_offset = 0;
  draw_preview(wdata->win, wdata);
 
  return FR_SUCCESS;
}

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preview_page_down()

static int preview_page_down ( struct PreviewWindowData * wdata, const struct KeyEvent * event )

static

Show the next page of the message - Implements preview_function_t -.

Definition at line 408 of file preview.c.

{
  if (!wdata->more_content)
  {
    if (event->count == 0)
      mutt_message(_("Bottom of message is shown"));
    return FR_NO_ACTION;
  }
 
  const int count = MAX(event->count, 1);
  const int page = MAX(wdata->win->state.rows - 1, 1);
  wdata->scroll_offset += count * page;
  draw_preview(wdata->win, wdata);
 
  return FR_SUCCESS;
}

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