121 lines
3.6 KiB
Go
121 lines
3.6 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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// all Controls that call base methods must be this
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type controlPrivate interface {
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widget() *C.GtkWidget
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Control
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}
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type controlParent struct {
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c *C.GtkContainer
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}
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func basesetParent(c controlPrivate, p *controlParent) {
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widget := c.widget() // avoid multiple interface lookups
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C.gtk_container_add(p.c, widget)
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// make sure the new widget is shown if not explicitly hidden
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C.gtk_widget_show_all(widget)
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}
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func basepreferredSize(c controlPrivate, 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 basecommitResize(c controlPrivate, a *allocation, d *sizing) {
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dobasecommitResize(c.widget(), a, d)
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}
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func dobasecommitResize(w *C.GtkWidget, c *allocation, 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(c.x)
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r.y = C.int(c.y)
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r.width = C.int(c.width)
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r.height = C.int(c.height)
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C.gtk_widget_size_allocate(w, &r)
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}
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func basegetAuxResizeInfo(c Control, d *sizing) {
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// controls set this to true if a Label to its left should be vertically aligned to the control's top
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d.shouldVAlignTop = false
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}
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type scroller struct {
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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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overlaywidget *C.GtkWidget
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overlaycontainer *C.GtkContainer
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overlay *C.GtkOverlay
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addShowWhich *C.GtkWidget
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}
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func newScroller(widget *C.GtkWidget, native bool, bordered bool, overlay bool) *scroller {
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var o *C.GtkWidget
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scrollwidget := C.gtk_scrolled_window_new(nil, nil)
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if overlay {
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o = C.gtk_overlay_new()
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}
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s := &scroller{
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scrollwidget: scrollwidget,
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scrollcontainer: (*C.GtkContainer)(unsafe.Pointer(scrollwidget)),
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scrollwindow: (*C.GtkScrolledWindow)(unsafe.Pointer(scrollwidget)),
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overlaywidget: o,
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overlaycontainer: (*C.GtkContainer)(unsafe.Pointer(o)),
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overlay: (*C.GtkOverlay)(unsafe.Pointer(o)),
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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 native {
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C.gtk_container_add(s.scrollcontainer, widget)
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} else {
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C.gtk_scrolled_window_add_with_viewport(s.scrollwindow, widget)
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}
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s.addShowWhich = s.scrollwidget
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if overlay {
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C.gtk_container_add(s.overlaycontainer, s.scrollwidget)
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s.addShowWhich = s.overlaywidget
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}
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return s
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}
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func (s *scroller) setParent(p *controlParent) {
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C.gtk_container_add(p.c, s.addShowWhich)
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// see basesetParent() above for why we call gtk_widget_show_all()
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C.gtk_widget_show_all(s.addShowWhich)
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}
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func (s *scroller) commitResize(c *allocation, d *sizing) {
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dobasecommitResize(s.addShowWhich, c, d)
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}
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