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cursor: refactor mode handling

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This commit is contained in:
Isaac Freund 2020-08-07 11:51:53 +02:00
parent 96a91fd2f7
commit 91052f7477
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GPG Key ID: 86DED400DDFD7A11
2 changed files with 158 additions and 195 deletions
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351
river/Cursor.zig
View File

@ -33,16 +33,6 @@ const Seat = @import("Seat.zig");
const View = @import("View.zig");
const ViewStack = @import("view_stack.zig").ViewStack;
const Mode = union(enum) {
passthrough: void,
move: MoveData,
resize: ResizeData,
};
const MoveData = struct {
view: *View,
};
const ResizeData = struct {
view: *View,
/// Offset from the lower right corner of the view
@ -50,6 +40,152 @@ const ResizeData = struct {
y_offset: i32,
};
const Mode = union(enum) {
passthrough: void,
move: *View,
resize: ResizeData,
/// Enter move or resize mode
fn enter(self: *Self, mode: @TagType(Mode), event: *c.wlr_event_pointer_button, view: *View) void {
std.debug.assert(self.mode == .passthrough);
log.debug(.cursor, "enter {} mode", .{@tagName(mode)});
const cur_box = &view.current.box;
self.mode = switch (mode) {
.passthrough => unreachable,
.move => .{ .move = view },
.resize => .{
.resize = .{
.view = view,
.x_offset = cur_box.x + @intCast(i32, cur_box.width) - @floatToInt(i32, self.wlr_cursor.x),
.y_offset = cur_box.y + @intCast(i32, cur_box.height) - @floatToInt(i32, self.wlr_cursor.y),
},
},
};
// Automatically float all views being moved by the pointer
if (!view.current.float) {
view.pending.float = true;
// Start a transaction to apply the pending state of the grabbed
// view and rearrange the layout to fill the hole.
view.output.root.arrange();
}
// Clear cursor focus, so that the surface does not receive events
c.wlr_seat_pointer_clear_focus(self.seat.wlr_seat);
c.wlr_xcursor_manager_set_cursor_image(
self.wlr_xcursor_manager,
if (mode == .move) "move" else "se-resize",
self.wlr_cursor,
);
}
/// Return from move/resize to passthrough
fn leave(self: *Self, event: *c.wlr_event_pointer_button) void {
std.debug.assert(self.mode != .passthrough);
log.debug(.cursor, "leave {} mode", .{@tagName(self.mode)});
self.mode = .passthrough;
passthrough(self, event.time_msec);
}
fn processMotion(self: *Self, device: *c.wlr_input_device, time: u32, delta_x: f64, delta_y: f64) void {
const border_width = self.seat.input_manager.server.config.border_width;
switch (self.mode) {
.passthrough => {
c.wlr_cursor_move(self.wlr_cursor, device, delta_x, delta_y);
passthrough(self, time);
},
.move => |view| {
var output_width: c_int = undefined;
var output_height: c_int = undefined;
c.wlr_output_effective_resolution(view.output.wlr_output, &output_width, &output_height);
// Set x/y of cursor and view, clamp to output dimensions
view.pending.box.x = std.math.clamp(
view.pending.box.x + @floatToInt(i32, delta_x),
@intCast(i32, border_width),
output_width - @intCast(i32, view.pending.box.width + border_width),
);
view.pending.box.y = std.math.clamp(
view.pending.box.y + @floatToInt(i32, delta_y),
@intCast(i32, border_width),
output_height - @intCast(i32, view.pending.box.height + border_width),
);
c.wlr_cursor_move(
self.wlr_cursor,
device,
@intToFloat(f64, view.pending.box.x - view.current.box.x),
@intToFloat(f64, view.pending.box.y - view.current.box.y),
);
// Apply new pending state (no need for a configure as size didn't change)
view.current = view.pending;
},
.resize => |data| {
var output_width: c_int = undefined;
var output_height: c_int = undefined;
c.wlr_output_effective_resolution(data.view.output.wlr_output, &output_width, &output_height);
// Set width/height of view, clamp to view size constraints and output dimensions
const box = &data.view.pending.box;
box.width = @intCast(u32, std.math.max(0, @intCast(i32, box.width) + @floatToInt(i32, delta_x)));
box.height = @intCast(u32, std.math.max(0, @intCast(i32, box.height) + @floatToInt(i32, delta_y)));
data.view.applyConstraints();
box.width = std.math.min(box.width, @intCast(u32, output_width - box.x - @intCast(i32, border_width)));
box.height = std.math.min(box.height, @intCast(u32, output_height - box.y - @intCast(i32, border_width)));
if (data.view.needsConfigure()) data.view.configure();
// Keep cursor locked to the original offset from the bottom right corner
c.wlr_cursor_warp_closest(
self.wlr_cursor,
device,
@intToFloat(f64, box.x + @intCast(i32, box.width) - data.x_offset),
@intToFloat(f64, box.y + @intCast(i32, box.height) - data.y_offset),
);
},
}
}
/// Pass an event on to the surface under the cursor, if any.
fn passthrough(self: *Self, time: u32) void {
var sx: f64 = undefined;
var sy: f64 = undefined;
if (self.surfaceAt(self.wlr_cursor.x, self.wlr_cursor.y, &sx, &sy)) |wlr_surface| {
// If input is allowed on the surface, send a pointer enter
// or motion even as needed.
if (self.seat.input_manager.inputAllowed(wlr_surface)) {
const wlr_seat = self.seat.wlr_seat;
const focus_change = wlr_seat.pointer_state.focused_surface != wlr_surface;
if (focus_change) {
log.debug(.cursor, "pointer notify enter at ({},{})", .{ sx, sy });
c.wlr_seat_pointer_notify_enter(wlr_seat, wlr_surface, sx, sy);
} else {
c.wlr_seat_pointer_notify_motion(wlr_seat, time, sx, sy);
}
return;
}
}
// There is either no surface under the cursor or input is disallowed
// Reset the cursor image to the default and clear focus.
c.wlr_xcursor_manager_set_cursor_image(
self.wlr_xcursor_manager,
"left_ptr",
self.wlr_cursor,
);
c.wlr_seat_pointer_clear_focus(self.seat.wlr_seat);
}
};
const default_size = 24;
seat: *Seat,
@ -178,61 +314,6 @@ fn handleAxis(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
);
}
/// Enter move or resize mode
fn enterCursorMode(self: *Self, event: *c.wlr_event_pointer_button, view: *View, mode: @TagType(Mode)) void {
std.debug.assert(self.mode == .passthrough);
log.debug(.cursor, "enter {} mode", .{@tagName(mode)});
const cur_box = &view.current.box;
self.mode = switch (mode) {
.passthrough => unreachable,
.move => .{ .move = .{ .view = view } },
.resize => .{
.resize = .{
.view = view,
.x_offset = cur_box.x + @intCast(i32, cur_box.width) - @floatToInt(i32, self.wlr_cursor.x),
.y_offset = cur_box.y + @intCast(i32, cur_box.height) - @floatToInt(i32, self.wlr_cursor.y),
},
},
};
// Automatically float all views being moved by the pointer
if (!view.current.float) {
view.pending.float = true;
// Start a transaction to apply the pending state of the grabbed
// view and rearrange the layout to fill the hole.
view.output.root.arrange();
}
// Clear cursor focus, so that the surface does not receive events
c.wlr_seat_pointer_clear_focus(self.seat.wlr_seat);
c.wlr_xcursor_manager_set_cursor_image(
self.wlr_xcursor_manager,
if (mode == .move) "move" else "se-resize",
self.wlr_cursor,
);
}
/// Return from move/resize to passthrough
fn leaveCursorMode(self: *Self, event: *c.wlr_event_pointer_button) void {
std.debug.assert(self.mode != .passthrough);
log.debug(.cursor, "leave {} mode", .{@tagName(self.mode)});
self.mode = .passthrough;
c.wlr_xcursor_manager_set_cursor_image(
self.wlr_xcursor_manager,
"left_ptr",
self.wlr_cursor,
);
// Cursor-Reentry by notifying surface underneath cursor.
processMotionPassthrough(self, event.time_msec);
}
fn handleButton(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
// This event is forwarded by the cursor when a pointer emits a button
// event.
@ -245,7 +326,7 @@ fn handleButton(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
std.debug.assert(self.pressed_count > 0);
self.pressed_count -= 1;
if (self.pressed_count == 0 and self.mode != .passthrough) {
self.leaveCursorMode(event);
Mode.leave(self, event);
return;
}
}
@ -274,9 +355,9 @@ fn handleButton(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
const fullscreen = view.current.fullscreen or view.pending.fullscreen;
if (self.seat.pointer_modifier) {
switch (event.button) {
c.BTN_LEFT => if (!fullscreen) self.enterCursorMode(event, view, .move),
c.BTN_LEFT => if (!fullscreen) Mode.enter(self, .move, event, view),
c.BTN_MIDDLE => view.close(),
c.BTN_RIGHT => if (!fullscreen) self.enterCursorMode(event, view, .resize),
c.BTN_RIGHT => if (!fullscreen) Mode.enter(self, .resize, event, view),
// TODO Some mice have additional buttons. These
// could also be bound to some useful action.
@ -315,21 +396,12 @@ fn handleMotionAbsolute(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C)
// emits these events.
const self = @fieldParentPtr(Self, "listen_motion_absolute", listener.?);
const event = util.voidCast(c.wlr_event_pointer_motion_absolute, data.?);
switch (self.mode) {
.passthrough => {
c.wlr_cursor_warp_absolute(self.wlr_cursor, event.device, event.x, event.y);
processMotionPassthrough(self, event.time_msec);
},
.move, .resize => {
var lx: f64 = undefined;
var ly: f64 = undefined;
c.wlr_cursor_absolute_to_layout_coords(self.wlr_cursor, event.device, event.x, event.y, &lx, &ly);
if (self.mode == .move)
self.processMotionMove(event.device, lx - self.wlr_cursor.x, ly - self.wlr_cursor.y)
else
self.processMotionResize(event.device, lx - self.wlr_cursor.x, ly - self.wlr_cursor.y);
},
}
var lx: f64 = undefined;
var ly: f64 = undefined;
c.wlr_cursor_absolute_to_layout_coords(self.wlr_cursor, event.device, event.x, event.y, &lx, &ly);
Mode.processMotion(self, event.device, event.time_msec, lx - self.wlr_cursor.x, ly - self.wlr_cursor.y);
}
fn handleMotion(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
@ -337,19 +409,8 @@ fn handleMotion(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
// pointer motion event (i.e. a delta)
const self = @fieldParentPtr(Self, "listen_motion", listener.?);
const event = util.voidCast(c.wlr_event_pointer_motion, data.?);
switch (self.mode) {
.passthrough => {
// The cursor doesn't move unless we tell it to. The cursor automatically
// handles constraining the motion to the output layout, as well as any
// special configuration applied for the specific input device which
// generated the event. You can pass NULL for the device if you want to move
// the cursor around without any input.
c.wlr_cursor_move(self.wlr_cursor, event.device, event.delta_x, event.delta_y);
processMotionPassthrough(self, event.time_msec);
},
.move => self.processMotionMove(event.device, event.delta_x, event.delta_y),
.resize => self.processMotionResize(event.device, event.delta_x, event.delta_y),
}
Mode.processMotion(self, event.device, event.time_msec, event.delta_x, event.delta_y);
}
fn handleRequestSetCursor(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C) void {
@ -375,104 +436,6 @@ fn handleRequestSetCursor(listener: ?*c.wl_listener, data: ?*c_void) callconv(.C
}
}
/// Move the cursor and the target view, constraining the view to the
/// dimensions of the output.
fn processMotionMove(self: *Self, device: *c.wlr_input_device, delta_x: f64, delta_y: f64) void {
const view = self.mode.move.view;
const border_width = self.seat.input_manager.server.config.border_width;
var output_width: c_int = undefined;
var output_height: c_int = undefined;
c.wlr_output_effective_resolution(view.output.wlr_output, &output_width, &output_height);
// Set x/y of cursor and view, clamp to output dimensions
view.pending.box.x = std.math.clamp(
view.pending.box.x + @floatToInt(i32, delta_x),
@intCast(i32, border_width),
output_width - @intCast(i32, view.pending.box.width + border_width),
);
view.pending.box.y = std.math.clamp(
view.pending.box.y + @floatToInt(i32, delta_y),
@intCast(i32, border_width),
output_height - @intCast(i32, view.pending.box.height + border_width),
);
c.wlr_cursor_move(
self.wlr_cursor,
device,
@intToFloat(f64, view.pending.box.x - view.current.box.x),
@intToFloat(f64, view.pending.box.y - view.current.box.y),
);
// Apply new pending state (no need for a configure as size didn't change)
view.current = view.pending;
}
fn processMotionResize(self: *Self, device: *c.wlr_input_device, delta_x: f64, delta_y: f64) void {
// Must be non-null if we are in resize mode
const view = self.mode.resize.view;
const border_width = self.seat.input_manager.server.config.border_width;
var output_width: c_int = undefined;
var output_height: c_int = undefined;
c.wlr_output_effective_resolution(view.output.wlr_output, &output_width, &output_height);
// Set width/height of view, clamp to view size constraints and output dimensions
const box = &view.pending.box;
box.width = @intCast(u32, std.math.max(0, @intCast(i32, box.width) + @floatToInt(i32, delta_x)));
box.height = @intCast(u32, std.math.max(0, @intCast(i32, box.height) + @floatToInt(i32, delta_y)));
view.applyConstraints();
box.width = std.math.min(box.width, @intCast(u32, output_width - box.x - @intCast(i32, border_width)));
box.height = std.math.min(box.height, @intCast(u32, output_height - box.y - @intCast(i32, border_width)));
if (view.needsConfigure()) view.configure();
// Keep cursor locked to the original offset from the bottom right corner
c.wlr_cursor_warp_closest(
self.wlr_cursor,
device,
@intToFloat(f64, box.x + @intCast(i32, box.width) - self.mode.resize.x_offset),
@intToFloat(f64, box.y + @intCast(i32, box.height) - self.mode.resize.y_offset),
);
}
fn processMotionPassthrough(self: *Self, time: u32) void {
var sx: f64 = undefined;
var sy: f64 = undefined;
if (self.surfaceAt(self.wlr_cursor.x, self.wlr_cursor.y, &sx, &sy)) |wlr_surface| {
// "Enter" the surface if necessary. This lets the client know that the
// cursor has entered one of its surfaces.
//
// Note that this gives the surface "pointer focus", which is distinct
// from keyboard focus. You get pointer focus by moving the pointer over
// a window.
if (self.seat.input_manager.inputAllowed(wlr_surface)) {
const wlr_seat = self.seat.wlr_seat;
const focus_change = wlr_seat.pointer_state.focused_surface != wlr_surface;
if (focus_change) {
log.debug(.cursor, "pointer notify enter at ({},{})", .{ sx, sy });
c.wlr_seat_pointer_notify_enter(wlr_seat, wlr_surface, sx, sy);
} else {
// The enter event contains coordinates, so we only need to notify
// on motion if the focus did not change.
c.wlr_seat_pointer_notify_motion(wlr_seat, time, sx, sy);
}
return;
}
}
// There is either no surface under the cursor or input is disallowed
// Reset the cursor image to the default
c.wlr_xcursor_manager_set_cursor_image(
self.wlr_xcursor_manager,
"left_ptr",
self.wlr_cursor,
);
// Clear pointer focus so future button events and such are not sent to
// the last client to have the cursor over it.
c.wlr_seat_pointer_clear_focus(self.seat.wlr_seat);
}
/// Find the topmost surface under the output layout coordinates lx/ly
/// returns the surface if found and sets the sx/sy parametes to the
/// surface coordinates.

2
river/InputManager.zig
View File

@ -108,7 +108,7 @@ pub fn isCursorActionTarget(self: Self, view: *View) bool {
const seat = &node.data;
switch (seat.cursor.mode) {
.passthrough => {},
.move => |data| if (data.view == view) break true,
.move => |target_view| if (target_view == view) break true,
.resize => |data| if (data.view == view) break true,
}
} else false;