122 lines
3.8 KiB
Go
122 lines
3.8 KiB
Go
// +build !windows,!darwin
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// 30 july 2014
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package ui
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import (
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"unsafe"
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)
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// #include "gtk_unix.h"
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import "C"
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type controlParent struct {
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c *C.GtkContainer
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}
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type controlSingleWidget struct {
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*controlbase
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widget *C.GtkWidget
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}
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func newControlSingleWidget(widget *C.GtkWidget) *controlSingleWidget {
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c := new(controlSingleWidget)
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c.controlbase = &controlbase{
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fsetParent: c.setParent,
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fpreferredSize: c.preferredSize,
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fresize: c.resize,
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}
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c.widget = widget
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return c
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}
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func (c *controlSingleWidget) setParent(p *controlParent) {
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C.gtk_container_add(p.c, c.widget)
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// make sure the new widget is shown if not explicitly hidden
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// TODO why did I have this again?
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C.gtk_widget_show_all(c.widget)
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}
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func (c *controlSingleWidget) preferredSize(d *sizing) (int, int) {
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// GTK+ 3 makes this easy: controls can tell us what their preferred size is!
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// ...actually, it tells us two things: the "minimum size" and the "natural size".
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// The "minimum size" is the smallest size we /can/ display /anything/. The "natural size" is the smallest size we would /prefer/ to display.
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// The difference? Minimum size takes into account things like truncation with ellipses: the minimum size of a label can allot just the ellipses!
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// So we use the natural size instead.
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// There is a warning about height-for-width controls, but in my tests this isn't an issue.
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var r C.GtkRequisition
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C.gtk_widget_get_preferred_size(c.widget, nil, &r)
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return int(r.width), int(r.height)
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}
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func (c *controlSingleWidget) resize(x int, y int, width int, height int, d *sizing) {
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// as we resize on size-allocate, we have to also use size-allocate on our children
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// this is fine anyway; in fact, this allows us to move without knowing what the container is!
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// this is what GtkBox does anyway
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// thanks to tristan in irc.gimp.net/#gtk+
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var r C.GtkAllocation
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r.x = C.int(x)
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r.y = C.int(y)
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r.width = C.int(width)
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r.height = C.int(height)
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C.gtk_widget_size_allocate(c.widget, &r)
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}
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type scroller struct {
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*controlSingleWidget
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scroller *controlSingleWidget
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scrollwidget *C.GtkWidget
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scrollcontainer *C.GtkContainer
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scrollwindow *C.GtkScrolledWindow
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overlay *controlSingleWidget
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overlaywidget *C.GtkWidget
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overlaycontainer *C.GtkContainer
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overlayoverlay *C.GtkOverlay
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}
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func newScroller(widget *C.GtkWidget, native bool, bordered bool, overlay bool) *scroller {
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s := new(scroller)
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s.controlSingleWidget = newControlSingleWidget(widget)
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s.scrollwidget = C.gtk_scrolled_window_new(nil, nil)
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s.scrollcontainer = (*C.GtkContainer)(unsafe.Pointer(s.scrollwidget))
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s.scrollwindow = (*C.GtkScrolledWindow)(unsafe.Pointer(s.scrollwidget))
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// any actual changing operations need to be done to the GtkScrolledWindow
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// that is, everything /except/ preferredSize() are done to the GtkScrolledWindow
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s.scroller = newControlSingleWidget(s.scrollwidget)
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s.fsetParent = s.scroller.fsetParent
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s.fresize = s.scroller.fresize
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// in GTK+ 3.4 we still technically need to use the separate gtk_scrolled_window_add_with_viewpoint()/gtk_container_add() spiel for adding the widget to the scrolled window
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if native {
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C.gtk_container_add(s.scrollcontainer, s.widget)
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} else {
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C.gtk_scrolled_window_add_with_viewport(s.scrollwindow, s.widget)
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}
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// give the scrolled window a border (thanks to jlindgren in irc.gimp.net/#gtk+)
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if bordered {
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C.gtk_scrolled_window_set_shadow_type(s.scrollwindow, C.GTK_SHADOW_IN)
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}
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if overlay {
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// ok things get REALLY fun now
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// we now have to do all of the above again
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s.overlaywidget = C.gtk_overlay_new()
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s.overlaycontainer = (*C.GtkContainer)(unsafe.Pointer(s.overlaywidget))
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s.overlayoverlay = (*C.GtkOverlay)(unsafe.Pointer(s.overlaywidget))
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s.overlay = newControlSingleWidget(s.overlaywidget)
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s.fsetParent = s.overlay.fsetParent
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s.fresize = s.overlay.fresize
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C.gtk_container_add(s.overlaycontainer, s.scrollwidget)
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}
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return s
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}
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