103 lines
3.0 KiB
Go
103 lines
3.0 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 controlbase struct {
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*controldefs
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widget *C.GtkWidget
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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 newControl(widget *C.GtkWidget) *controlbase {
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c := new(controlbase)
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c.widget = widget
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c.controldefs = new(controldefs)
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c.fsetParent = func(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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c.containerShow()
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}
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c.fcontainerShow = func() {
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C.gtk_widget_show_all(c.widget)
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}
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c.fcontainerHide = func() {
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C.gtk_widget_hide(c.widget)
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}
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c.fallocate = baseallocate(c)
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c.fpreferredSize = func(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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// For Areas, we manually save the Area size and use that, just to be safe.
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//TODO
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/*
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if s.ctype == c_area {
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return s.areawidth, s.areaheight
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}
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*/
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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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c.fcommitResize = func(a *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(a.x)
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r.y = C.int(a.y)
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r.width = C.int(a.width)
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r.height = C.int(a.height)
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C.gtk_widget_size_allocate(c.widget, &r)
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}
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c.fgetAuxResizeInfo = func(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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return c
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}
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type scrolledcontrol struct {
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*controlbase
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scroller *controlbase
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scrollcontainer *C.GtkContainer
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scrollwindow *C.GtkScrolledWindow
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}
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func newScrolledControl(widget *C.GtkWidget, native bool) *scrolledcontrol {
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scroller := C.gtk_scrolled_window_new(nil, nil)
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s := &scrolledcontrol{
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controlbase: newControl(widget),
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scroller: newControl(scroller),
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scrollcontainer: (*C.GtkContainer)(unsafe.Pointer(scroller)),
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scrollwindow: (*C.GtkScrolledWindow)(unsafe.Pointer(scroller)),
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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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C.gtk_scrolled_window_set_shadow_type(s.scrollwindow, C.GTK_SHADOW_IN)
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C.gtk_container_add(s.scrollcontainer, s.widget)
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s.fsetParent = s.scroller.fsetParent
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s.fcommitResize = s.scroller.fcommitResize
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return s
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}
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