From bb4a02babc7bb387514524c37a9b33e5d6a80e1b Mon Sep 17 00:00:00 2001
From: Elias Naur <mail@eliasnaur.com>
Date: Sun, 17 May 2020 15:08:12 +0200
Subject: [PATCH] app/internal/window: [iOS] implement clipboard

Updates gio#31

Signed-off-by: Elias Naur <mail@eliasnaur.com>
---
 app/internal/window/os_ios.go | 22 ++++++++++++++++++++++
 app/internal/window/os_ios.m  | 18 ++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/app/internal/window/os_ios.go b/app/internal/window/os_ios.go
index 959efdce..0361e868 100644
--- a/app/internal/window/os_ios.go
+++ b/app/internal/window/os_ios.go
@@ -17,6 +17,8 @@ __attribute__ ((visibility ("hidden"))) void gio_addLayerToView(CFTypeRef viewRe
 __attribute__ ((visibility ("hidden"))) void gio_updateView(CFTypeRef viewRef, CFTypeRef layerRef);
 __attribute__ ((visibility ("hidden"))) void gio_removeLayer(CFTypeRef layerRef);
 __attribute__ ((visibility ("hidden"))) void gio_setAnimating(CFTypeRef viewRef, int anim);
+__attribute__ ((visibility ("hidden"))) CFTypeRef gio_readClipboard(void);
+__attribute__ ((visibility ("hidden"))) void gio_writeClipboard(unichar *chars, NSUInteger length);
 */
 import "C"
 
@@ -26,6 +28,8 @@ import (
 	"runtime/debug"
 	"sync/atomic"
 	"time"
+	"unicode/utf16"
+	"unsafe"
 
 	"gioui.org/f32"
 	"gioui.org/io/key"
@@ -199,6 +203,24 @@ func onTouch(last C.int, view, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.C
 	})
 }
 
+func (w *window) ReadClipboard() {
+	runOnMain(func() {
+		content := nsstringToString(C.gio_readClipboard())
+		w.w.Event(system.ClipboardEvent{Text: content})
+	})
+}
+
+func (w *window) WriteClipboard(s string) {
+	u16 := utf16.Encode([]rune(s))
+	runOnMain(func() {
+		var chars *C.unichar
+		if len(u16) > 0 {
+			chars = (*C.unichar)(unsafe.Pointer(&u16[0]))
+		}
+		C.gio_writeClipboard(chars, C.NSUInteger(len(u16)))
+	})
+}
+
 func (w *window) SetAnimating(anim bool) {
 	v := w.view
 	if v == 0 {
diff --git a/app/internal/window/os_ios.m b/app/internal/window/os_ios.m
index ba4412a8..b5295799 100644
--- a/app/internal/window/os_ios.m
+++ b/app/internal/window/os_ios.m
@@ -279,6 +279,24 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
 @end
 
+void gio_writeClipboard(unichar *chars, NSUInteger length) {
+	@autoreleasepool {
+		NSString *s = [NSString string];
+		if (length > 0) {
+			s = [NSString stringWithCharacters:chars length:length];
+		}
+		UIPasteboard *p = UIPasteboard.generalPasteboard;
+		p.string = s;
+	}
+}
+
+CFTypeRef gio_readClipboard(void) {
+	@autoreleasepool {
+		UIPasteboard *p = UIPasteboard.generalPasteboard;
+		return (__bridge_retained CFTypeRef)p.string;
+	}
+}
+
 void gio_setAnimating(CFTypeRef viewRef, int anim) {
 	GioView *view = (__bridge GioView *)viewRef;
 	[view setAnimating:(anim ? YES : NO)];