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fix(electrobun): fix gtk-resize.ts syntax error + Buffer-based FFI pointers

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Fixed malformed block comment that prevented bun bundler from compiling.
Switched from TypedArray.buffer to Buffer.alloc for FFI output pointers.
Disabled motion handler to isolate button-press resize.

NOTE: Electrobun's dev command rebuilds the bundle on every run, overwriting
manual builds. To test changes, run: bun build src/bun/index.ts --outfile
build/.../app/bun/index.js --target=bun --external=electrobun AFTER
electrobun dev finishes building, then restart the app.
This commit is contained in:
Hibryda 2026-03-25 15:59:51 +01:00
parent e9fcd8401e
commit 828e97276a
1 changed files with 68 additions and 138 deletions
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190
ui-electrobun/src/bun/gtk-resize.ts
View file

@ -4,186 +4,116 @@
* Connects button-press-event and motion-notify-event directly on the
* GtkWindow via FFI. Hit-test and begin_resize_drag happen SYNCHRONOUSLY
* in the native GTK event loop, BEFORE WebKitGTK sees the events.
*
* This is the ONLY approach that works for undecorated WebKitGTK windows.
* JS-side approaches (RPC, window.resizeTo, XMoveResizeWindow) all fail
* because WebKitGTK either steals the grab or blocks the resize.
*/
import { dlopen, FFIType, JSCallback, ptr } from "bun:ffi";
const BORDER = 8; // resize border width in pixels
// GdkWindowEdge values
const BORDER = 8;
const EDGE_NW = 0, EDGE_N = 1, EDGE_NE = 2;
const EDGE_W = 3, EDGE_E = 4;
const EDGE_SW = 5, EDGE_S = 6, EDGE_SE = 7;
const CURSORS = ["nw-resize","n-resize","ne-resize","w-resize","","e-resize","sw-resize","s-resize","se-resize"];
// Cursor names indexed by edge
const CURSORS = [
"nw-resize", "n-resize", "ne-resize",
"w-resize", "", "e-resize",
"sw-resize", "s-resize", "se-resize",
];
let lib: ReturnType<typeof dlopen> | null = null;
let gtk: ReturnType<typeof dlopen> | null = null;
function getLib() {
if (lib) return lib;
lib = dlopen("libgtk-3.so.0", {
if (gtk) return gtk;
gtk = dlopen("libgtk-3.so.0", {
gtk_widget_add_events: { args: [FFIType.ptr, FFIType.i32], returns: FFIType.void },
gtk_window_begin_resize_drag: {
args: [FFIType.ptr, FFIType.i32, FFIType.i32, FFIType.i32, FFIType.i32, FFIType.u32],
returns: FFIType.void,
},
gtk_window_begin_resize_drag: { args: [FFIType.ptr, FFIType.i32, FFIType.i32, FFIType.i32, FFIType.i32, FFIType.u32], returns: FFIType.void },
gtk_widget_get_window: { args: [FFIType.ptr], returns: FFIType.ptr },
g_signal_connect_data: {
args: [FFIType.ptr, FFIType.cstring, FFIType.ptr, FFIType.ptr, FFIType.ptr, FFIType.i32],
returns: FFIType.u64,
},
// GdkWindow methods
g_signal_connect_data: { args: [FFIType.ptr, FFIType.ptr, FFIType.ptr, FFIType.ptr, FFIType.ptr, FFIType.i32], returns: FFIType.u64 },
gdk_window_get_position: { args: [FFIType.ptr, FFIType.ptr, FFIType.ptr], returns: FFIType.void },
gdk_window_get_width: { args: [FFIType.ptr], returns: FFIType.i32 },
gdk_window_get_height: { args: [FFIType.ptr], returns: FFIType.i32 },
// GdkCursor
gdk_cursor_new_from_name: { args: [FFIType.ptr, FFIType.cstring], returns: FFIType.ptr },
gdk_cursor_new_from_name: { args: [FFIType.ptr, FFIType.ptr], returns: FFIType.ptr },
gdk_window_set_cursor: { args: [FFIType.ptr, FFIType.ptr], returns: FFIType.void },
gdk_display_get_default: { args: [], returns: FFIType.ptr },
// GdkEvent field extraction
gdk_event_get_button: { args: [FFIType.ptr, FFIType.ptr], returns: FFIType.bool },
gdk_event_get_root_coords: { args: [FFIType.ptr, FFIType.ptr, FFIType.ptr], returns: FFIType.bool },
gdk_event_get_time: { args: [FFIType.ptr], returns: FFIType.u32 },
gdk_event_get_coords: { args: [FFIType.ptr, FFIType.ptr, FFIType.ptr], returns: FFIType.bool },
});
return lib;
return gtk;
}
/**
* Hit-test: is the point within BORDER pixels of any edge?
* Returns GdkWindowEdge value (0-7) or -1 if inside content area.
*/
function hitTest(
left: number, top: number, right: number, bottom: number,
cx: number, cy: number, border: number,
): number {
const onLeft = cx < left + border;
const onRight = cx >= right - border;
const onTop = cy < top + border;
const onBottom = cy >= bottom - border;
if (onTop && onLeft) return EDGE_NW;
if (onTop && onRight) return EDGE_NE;
if (onBottom && onLeft) return EDGE_SW;
if (onBottom && onRight) return EDGE_SE;
if (onTop) return EDGE_N;
if (onBottom) return EDGE_S;
if (onLeft) return EDGE_W;
if (onRight) return EDGE_E;
function hitTest(l: number, t: number, r: number, b: number, cx: number, cy: number, border: number): number {
const oL = cx < l + border, oR = cx >= r - border, oT = cy < t + border, oB = cy >= b - border;
if (oT && oL) return EDGE_NW; if (oT && oR) return EDGE_NE;
if (oB && oL) return EDGE_SW; if (oB && oR) return EDGE_SE;
if (oT) return EDGE_N; if (oB) return EDGE_S;
if (oL) return EDGE_W; if (oR) return EDGE_E;
return -1;
}
// Keep JSCallback references alive (prevent GC)
// Module-level state — set by installNativeResize, read by callbacks
let storedWindowPtr: any = null;
let motionCb: JSCallback | null = null;
let buttonCb: JSCallback | null = null;
/**
* Install native GTK event handlers for resize on an undecorated window.
* Must be called ONCE after window creation.
*/
export function installNativeResize(windowPtr: number | bigint) {
const gtk = getLib();
if (!gtk) { console.error("[gtk-resize] Failed to load libgtk-3.so.0"); return; }
// Shared buffers — use Buffer.alloc for reliable FFI pointer passing
const xBuf = Buffer.alloc(8); // gdouble (8 bytes)
const yBuf = Buffer.alloc(8);
const btnBuf = Buffer.alloc(4); // guint (4 bytes)
const posXBuf = Buffer.alloc(4); // gint (4 bytes)
const posYBuf = Buffer.alloc(4);
// Add required event masks
const GDK_POINTER_MOTION_MASK = 1 << 2;
const GDK_BUTTON_PRESS_MASK = 1 << 8;
const GDK_BUTTON1_MOTION_MASK = 1 << 5;
gtk.symbols.gtk_widget_add_events(
windowPtr as any,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON1_MOTION_MASK,
);
// Shared buffers for extracting event fields
const xBuf = new Float64Array(1);
const yBuf = new Float64Array(1);
const btnBuf = new Uint32Array(1);
function getWindowBounds(): { left: number; top: number; right: number; bottom: number } | null {
const gdkWin = gtk!.symbols.gtk_widget_get_window(windowPtr as any);
function getWindowBounds() {
if (!gtk || !storedWindowPtr) return null;
const gdkWin = gtk.symbols.gtk_widget_get_window(storedWindowPtr);
if (!gdkWin) return null;
const xArr = new Int32Array(1);
const yArr = new Int32Array(1);
gtk!.symbols.gdk_window_get_position(gdkWin, ptr(xArr.buffer) as any, ptr(yArr.buffer) as any);
const w = gtk!.symbols.gdk_window_get_width(gdkWin);
const h = gtk!.symbols.gdk_window_get_height(gdkWin);
return { left: xArr[0], top: yArr[0], right: xArr[0] + w, bottom: yArr[0] + h };
gtk.symbols.gdk_window_get_position(gdkWin, ptr(posXBuf) as any, ptr(posYBuf) as any);
const w = gtk.symbols.gdk_window_get_width(gdkWin);
const h = gtk.symbols.gdk_window_get_height(gdkWin);
const left = posXBuf.readInt32LE(0);
const top = posYBuf.readInt32LE(0);
return { left, top, right: left + w, bottom: top + h };
}
// Motion notify — update cursor when hovering over edges
motionCb = new JSCallback(
(_widget: any, event: any, _userData: any) => {
const bounds = getWindowBounds();
if (!bounds) return 0;
gtk!.symbols.gdk_event_get_root_coords(event, ptr(xBuf.buffer) as any, ptr(yBuf.buffer) as any);
const cx = xBuf[0], cy = yBuf[0];
const edge = hitTest(bounds.left, bounds.top, bounds.right, bounds.bottom, cx, cy, BORDER);
export function installNativeResize(windowPtr: number | bigint) {
const lib = getLib();
if (!lib) { console.error("[gtk-resize] Failed to load libgtk-3.so.0"); return; }
storedWindowPtr = windowPtr;
const gdkWin = gtk!.symbols.gtk_widget_get_window(windowPtr as any);
if (gdkWin) {
const display = gtk!.symbols.gdk_display_get_default();
if (display) {
const cursorName = edge >= 0 ? CURSORS[edge] : "default";
const cursorBuf = Buffer.from(cursorName + "\0");
const cursor = gtk!.symbols.gdk_cursor_new_from_name(display, ptr(cursorBuf) as any);
gtk!.symbols.gdk_window_set_cursor(gdkWin, cursor);
}
}
return 0; // Proceed — let motion events reach WebKit for hover etc.
},
{ args: [FFIType.ptr, FFIType.ptr, FFIType.ptr], returns: FFIType.i32 },
);
// Add event masks
lib.symbols.gtk_widget_add_events(windowPtr as any, (1<<2) | (1<<8) | (1<<5));
// Motion handler disabled — isolating button-press resize first
// TODO: re-enable cursor change on hover once resize works
// Button press — initiate resize if in border zone
buttonCb = new JSCallback(
(_widget: any, event: any, _userData: any) => {
gtk!.symbols.gdk_event_get_button(event, ptr(btnBuf.buffer) as any);
if (btnBuf[0] !== 1) return 0; // Only LMB
(_w: any, event: any, _u: any) => {
try {
gtk!.symbols.gdk_event_get_button(event, ptr(btnBuf) as any);
if (btnBuf.readUInt32LE(0) !== 1) return 0; // LMB only
gtk!.symbols.gdk_event_get_root_coords(event, ptr(xBuf.buffer) as any, ptr(yBuf.buffer) as any);
const cx = xBuf[0], cy = yBuf[0];
gtk!.symbols.gdk_event_get_root_coords(event, ptr(xBuf) as any, ptr(yBuf) as any);
const cx = xBuf.readDoubleLE(0);
const cy = yBuf.readDoubleLE(0);
const bounds = getWindowBounds();
if (!bounds) return 0;
const edge = hitTest(bounds.left, bounds.top, bounds.right, bounds.bottom, cx, cy, BORDER);
if (edge < 0) return 0; // Inside content — let WebKit handle it
if (edge < 0) return 0; // Inside content — let WebKit handle
const timestamp = gtk!.symbols.gdk_event_get_time(event);
console.log(`[gtk-resize] begin_resize_drag edge=${edge} @${Math.round(cx)},${Math.round(cy)} t=${timestamp}`);
console.log(`[gtk-resize] begin_resize_drag edge=${edge} t=${timestamp}`);
gtk!.symbols.gtk_window_begin_resize_drag(
windowPtr as any,
edge,
1, // LMB
Math.round(cx),
Math.round(cy),
timestamp, // REAL event timestamp — not GDK_CURRENT_TIME
storedWindowPtr, edge, 1,
Math.round(cx), Math.round(cy),
timestamp,
);
return 1; // TRUE — STOP propagation. WebKit does NOT see this button press.
return 1; // TRUE — STOP propagation
} catch (e) { console.error("[gtk-resize] button error:", e); return 0; }
},
{ args: [FFIType.ptr, FFIType.ptr, FFIType.ptr], returns: FFIType.i32 },
);
// Connect signals — button-press FIRST (higher priority)
// Bun FFI requires Buffer for cstring args, not JS strings
const sigButtonPress = Buffer.from("button-press-event\0");
const sigMotionNotify = Buffer.from("motion-notify-event\0");
gtk.symbols.g_signal_connect_data(
windowPtr as any, ptr(sigButtonPress) as any, buttonCb.ptr as any, null, null, 0,
);
gtk.symbols.g_signal_connect_data(
windowPtr as any, ptr(sigMotionNotify) as any, motionCb.ptr as any, null, null, 0,
);
const sigBP = Buffer.from("button-press-event\0");
lib.symbols.g_signal_connect_data(windowPtr as any, ptr(sigBP) as any, buttonCb.ptr as any, null, null, 0);
// Motion handler disabled for now — isolating button-press resize
// const sigMN = Buffer.from("motion-notify-event\0");
// lib.symbols.g_signal_connect_data(windowPtr as any, ptr(sigMN) as any, motionCb.ptr as any, null, null, 0);
console.log("[gtk-resize] Native resize handlers installed (border=" + BORDER + "px)");
}