Micah Johnston
GitHub
commit
1d9806d5bd
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@ -29,7 +29,7 @@ xcb-util = { version = "0.3", features = ["icccm"] }
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nix = "0.22.0"
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[target.'cfg(target_os="windows")'.dependencies]
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winapi = { version = "0.3.8", features = ["libloaderapi", "winuser", "windef", "minwindef", "guiddef", "combaseapi", "wingdi", "errhandlingapi"] }
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winapi = { version = "0.3.8", features = ["libloaderapi", "winuser", "windef", "minwindef", "guiddef", "combaseapi", "wingdi", "errhandlingapi", "ole2", "oleidl", "shellapi", "winerror"] }
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uuid = { version = "0.8", features = ["v4"], optional = true }
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[target.'cfg(target_os="macos")'.dependencies]
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50
src/event.rs
50
src/event.rs
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@ -1,3 +1,5 @@
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use std::path::PathBuf;
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use keyboard_types::{KeyboardEvent, Modifiers};
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use crate::{Point, WindowInfo};
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@ -32,7 +34,7 @@ pub enum ScrollDelta {
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},
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}
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#[derive(Debug, Clone, Copy, PartialEq)]
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#[derive(Debug, Clone, PartialEq)]
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pub enum MouseEvent {
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/// The mouse cursor was moved
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CursorMoved {
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@ -75,6 +77,35 @@ pub enum MouseEvent {
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///
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/// May not be available on all platforms.
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CursorLeft,
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DragEntered {
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/// The logical coordinates of the mouse position
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position: Point,
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/// The modifiers that were held down just before the event.
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modifiers: Modifiers,
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/// Data being dragged
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data: DropData,
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},
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DragMoved {
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/// The logical coordinates of the mouse position
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position: Point,
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/// The modifiers that were held down just before the event.
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modifiers: Modifiers,
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/// Data being dragged
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data: DropData,
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},
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DragLeft,
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DragDropped {
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/// The logical coordinates of the mouse position
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position: Point,
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/// The modifiers that were held down just before the event.
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modifiers: Modifiers,
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/// Data being dragged
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data: DropData,
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},
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}
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#[derive(Debug, Clone)]
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@ -92,6 +123,20 @@ pub enum Event {
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Window(WindowEvent),
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}
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#[derive(Debug, Clone, Copy, PartialEq)]
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pub enum DropEffect {
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Copy,
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Move,
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Link,
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Scroll,
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}
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#[derive(Debug, Clone, PartialEq)]
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pub enum DropData {
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None,
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Files(Vec<PathBuf>),
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}
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/// Return value for [WindowHandler::on_event](`crate::WindowHandler::on_event()`),
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/// indicating whether the event was handled by your window or should be passed
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/// back to the platform.
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@ -111,4 +156,7 @@ pub enum EventStatus {
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/// DAW functionality for playing piano keys with the keyboard while a
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/// plugin window is in focus.
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Ignored,
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/// We are prepared to handle the data in the drag and dropping will
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/// result in [DropEffect]
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AcceptDrop(DropEffect),
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}
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268
src/win/drop_target.rs
Normal file
268
src/win/drop_target.rs
Normal file
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@ -0,0 +1,268 @@
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use std::ffi::OsString;
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use std::mem::transmute;
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use std::os::windows::prelude::OsStringExt;
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use std::ptr::null_mut;
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use std::rc::{Weak, Rc};
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use winapi::Interface;
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use winapi::shared::guiddef::{REFIID, IsEqualIID};
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use winapi::shared::minwindef::{DWORD, WPARAM};
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use winapi::shared::ntdef::{HRESULT, ULONG};
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use winapi::shared::windef::POINTL;
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use winapi::shared::winerror::{S_OK, E_NOINTERFACE, E_UNEXPECTED};
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use winapi::shared::wtypes::DVASPECT_CONTENT;
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use winapi::um::objidl::{IDataObject, FORMATETC, TYMED_HGLOBAL, STGMEDIUM};
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use winapi::um::oleidl::{IDropTarget, IDropTargetVtbl, DROPEFFECT_COPY, DROPEFFECT_MOVE, DROPEFFECT_LINK, DROPEFFECT_SCROLL, DROPEFFECT_NONE};
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use winapi::um::shellapi::DragQueryFileW;
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use winapi::um::unknwnbase::{IUnknownVtbl, IUnknown};
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use winapi::um::winuser::CF_HDROP;
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use crate::{Point, DropData, MouseEvent, Event, EventStatus, DropEffect, PhyPoint};
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use super::WindowState;
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// These function pointers have to be stored in a (const) variable before they can be transmuted
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// Transmuting is needed because winapi has a bug where the pt parameter has an incorrect
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// type `*const POINTL`
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const DRAG_ENTER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_enter;
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const DRAG_OVER_PTR: unsafe extern "system" fn(this: *mut IDropTarget, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drag_over;
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const DROP_PTR: unsafe extern "system" fn(this: *mut IDropTarget, pDataObj: *const IDataObject, grfKeyState: DWORD, pt: POINTL, pdwEffect: *mut DWORD) -> HRESULT = DropTarget::drop;
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const DROP_TARGET_VTBL: IDropTargetVtbl = IDropTargetVtbl {
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parent: IUnknownVtbl {
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QueryInterface: DropTarget::query_interface,
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AddRef: DropTarget::add_ref,
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Release: DropTarget::release,
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},
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DragEnter: unsafe { transmute(DRAG_ENTER_PTR) },
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DragOver: unsafe { transmute(DRAG_OVER_PTR) },
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DragLeave: DropTarget::drag_leave,
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Drop: unsafe { transmute(DROP_PTR) },
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};
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#[repr(C)]
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pub(super) struct DropTarget {
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base: IDropTarget,
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window_state: Weak<WindowState>,
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// These are cached since DragOver and DragLeave callbacks don't provide them,
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// and handling drag move events gets awkward on the client end otherwise
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drag_position: Point,
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drop_data: DropData,
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}
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impl DropTarget {
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pub(super) fn new(window_state: Weak<WindowState>) -> Self {
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Self {
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base: IDropTarget { lpVtbl: &DROP_TARGET_VTBL },
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window_state,
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drag_position: Point::new(0.0, 0.0),
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drop_data: DropData::None,
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}
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}
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fn on_event(&self, pdwEffect: Option<*mut DWORD>, event: MouseEvent) {
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let Some(window_state) = self.window_state.upgrade() else {
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return;
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};
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unsafe {
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let mut window = window_state.create_window();
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let mut window = crate::Window::new(&mut window);
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let event = Event::Mouse(event);
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let event_status = window_state.handler_mut().as_mut().unwrap().on_event(&mut window, event);
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if let Some(pdwEffect) = pdwEffect {
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match event_status {
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EventStatus::AcceptDrop(DropEffect::Copy) => *pdwEffect = DROPEFFECT_COPY,
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EventStatus::AcceptDrop(DropEffect::Move) => *pdwEffect = DROPEFFECT_MOVE,
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EventStatus::AcceptDrop(DropEffect::Link) => *pdwEffect = DROPEFFECT_LINK,
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EventStatus::AcceptDrop(DropEffect::Scroll) => *pdwEffect = DROPEFFECT_SCROLL,
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_ => *pdwEffect = DROPEFFECT_NONE,
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}
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}
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}
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}
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fn parse_coordinates(&mut self, pt: POINTL) {
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let Some(window_state) = self.window_state.upgrade() else {
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return;
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};
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let phy_point = PhyPoint::new(pt.x, pt.y);
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self.drag_position = phy_point.to_logical(&window_state.window_info());
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}
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fn parse_drop_data(&mut self, data_object: &IDataObject) {
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let format = FORMATETC {
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cfFormat: CF_HDROP as u16,
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ptd: null_mut(),
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dwAspect: DVASPECT_CONTENT,
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lindex: -1,
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tymed: TYMED_HGLOBAL,
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};
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let mut medium = STGMEDIUM {
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tymed: 0,
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u: null_mut(),
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pUnkForRelease: null_mut(),
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};
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unsafe {
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let hresult = data_object.GetData(&format, &mut medium);
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if hresult != S_OK {
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self.drop_data = DropData::None;
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return;
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}
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let hdrop = transmute((*medium.u).hGlobal());
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let item_count = DragQueryFileW(hdrop, 0xFFFFFFFF, null_mut(), 0);
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if item_count == 0 {
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self.drop_data = DropData::None;
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return;
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}
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let mut paths = Vec::with_capacity(item_count as usize);
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for i in 0..item_count {
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let characters = DragQueryFileW(hdrop, i, null_mut(), 0);
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let buffer_size = characters as usize + 1;
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let mut buffer = Vec::<u16>::with_capacity(buffer_size);
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DragQueryFileW(hdrop, i, transmute(buffer.spare_capacity_mut().as_mut_ptr()), buffer_size as u32);
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buffer.set_len(buffer_size);
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paths.push(OsString::from_wide(&buffer[..characters as usize]).into())
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}
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self.drop_data = DropData::Files(paths);
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}
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}
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unsafe extern "system" fn query_interface(
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this: *mut IUnknown,
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riid: REFIID,
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ppvObject: *mut *mut winapi::ctypes::c_void,
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) -> HRESULT
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{
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if IsEqualIID(&*riid, &IUnknown::uuidof()) || IsEqualIID(&*riid, &IDropTarget::uuidof()){
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Self::add_ref(this);
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*ppvObject = this as *mut winapi::ctypes::c_void;
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return S_OK;
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}
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return E_NOINTERFACE;
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}
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unsafe extern "system" fn add_ref(this: *mut IUnknown) -> ULONG {
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let arc = Rc::from_raw(this);
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let result = Rc::strong_count(&arc) + 1;
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let _ = Rc::into_raw(arc);
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Rc::increment_strong_count(this);
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result as ULONG
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}
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unsafe extern "system" fn release(this: *mut IUnknown) -> ULONG {
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let arc = Rc::from_raw(this);
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let result = Rc::strong_count(&arc) - 1;
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let _ = Rc::into_raw(arc);
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Rc::decrement_strong_count(this);
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result as ULONG
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}
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unsafe extern "system" fn drag_enter(
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this: *mut IDropTarget,
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pDataObj: *const IDataObject,
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grfKeyState: DWORD,
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pt: POINTL,
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pdwEffect: *mut DWORD,
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) -> HRESULT
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{
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let drop_target = &mut *(this as *mut DropTarget);
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let Some(window_state) = drop_target.window_state.upgrade() else {
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return E_UNEXPECTED;
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};
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let modifiers = window_state.keyboard_state().get_modifiers_from_mouse_wparam(grfKeyState as WPARAM);
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drop_target.parse_coordinates(pt);
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drop_target.parse_drop_data(&*pDataObj);
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let event = MouseEvent::DragEntered {
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position: drop_target.drag_position,
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modifiers,
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data: drop_target.drop_data.clone(),
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};
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drop_target.on_event(Some(pdwEffect), event);
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S_OK
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}
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unsafe extern "system" fn drag_over(
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this: *mut IDropTarget,
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grfKeyState: DWORD,
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pt: POINTL,
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pdwEffect: *mut DWORD,
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) -> HRESULT
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{
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let drop_target = &mut *(this as *mut DropTarget);
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let Some(window_state) = drop_target.window_state.upgrade() else {
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return E_UNEXPECTED;
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};
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let modifiers = window_state.keyboard_state().get_modifiers_from_mouse_wparam(grfKeyState as WPARAM);
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drop_target.parse_coordinates(pt);
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let event = MouseEvent::DragMoved {
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position: drop_target.drag_position,
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modifiers,
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data: drop_target.drop_data.clone(),
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};
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drop_target.on_event(Some(pdwEffect), event);
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S_OK
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}
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unsafe extern "system" fn drag_leave(this: *mut IDropTarget) -> HRESULT {
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let drop_target = &mut *(this as *mut DropTarget);
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drop_target.on_event(None, MouseEvent::DragLeft);
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S_OK
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}
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unsafe extern "system" fn drop(
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this: *mut IDropTarget,
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pDataObj: *const IDataObject,
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grfKeyState: DWORD,
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pt: POINTL,
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pdwEffect: *mut DWORD,
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) -> HRESULT
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{
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let drop_target = &mut *(this as *mut DropTarget);
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let Some(window_state) = drop_target.window_state.upgrade() else {
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return E_UNEXPECTED;
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};
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let modifiers = window_state.keyboard_state().get_modifiers_from_mouse_wparam(grfKeyState as WPARAM);
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drop_target.parse_coordinates(pt);
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drop_target.parse_drop_data(&*pDataObj);
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let event = MouseEvent::DragDropped {
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position: drop_target.drag_position,
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modifiers,
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data: drop_target.drop_data.clone(),
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};
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drop_target.on_event(Some(pdwEffect), event);
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S_OK
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}
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}
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@ -1,3 +1,4 @@
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mod drop_target;
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mod keyboard;
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mod window;
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@ -2,6 +2,8 @@ use winapi::shared::guiddef::GUID;
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use winapi::shared::minwindef::{ATOM, FALSE, LPARAM, LRESULT, UINT, WPARAM};
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use winapi::shared::windef::{HWND, RECT};
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use winapi::um::combaseapi::CoCreateGuid;
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use winapi::um::ole2::{RegisterDragDrop, OleInitialize, RevokeDragDrop};
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use winapi::um::oleidl::LPDROPTARGET;
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use winapi::um::winuser::{
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AdjustWindowRectEx, CreateWindowExW, DefWindowProcW, DestroyWindow, DispatchMessageW,
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GetDpiForWindow, GetMessageW, GetWindowLongPtrW, LoadCursorW, PostMessageW, RegisterClassW,
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@ -16,7 +18,7 @@ use winapi::um::winuser::{
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XBUTTON1, XBUTTON2,
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};
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use std::cell::{Cell, RefCell};
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use std::cell::{Cell, RefCell, Ref, RefMut};
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use std::collections::VecDeque;
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use std::ffi::{c_void, OsStr};
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use std::marker::PhantomData;
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@ -33,6 +35,7 @@ use crate::{
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WindowHandler, WindowInfo, WindowOpenOptions, WindowScalePolicy,
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};
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use super::drop_target::DropTarget;
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use super::keyboard::KeyboardState;
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#[cfg(feature = "opengl")]
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@ -147,9 +150,10 @@ unsafe extern "system" fn wnd_proc(
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// NOTE: This is not handled in `wnd_proc_inner` because of the deferred task loop above
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if msg == WM_NCDESTROY {
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RevokeDragDrop(hwnd);
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unregister_wnd_class((*window_state_ptr).window_class);
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SetWindowLongPtrW(hwnd, GWLP_USERDATA, 0);
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drop(Box::from_raw(window_state_ptr));
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drop(Rc::from_raw(window_state_ptr));
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}
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// The actual custom window proc has been moved to another function so we can always handle
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@ -446,7 +450,7 @@ unsafe fn unregister_wnd_class(wnd_class: ATOM) {
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/// because of the Windows message loops' reentrant nature. Care still needs to be taken to prevent
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/// `handler` from indirectly triggering other events that would also need to be handled using
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/// `handler`.
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struct WindowState {
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pub(super) struct WindowState {
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/// The HWND belonging to this window. The window's actual state is stored in the `WindowState`
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/// struct associated with this HWND through `unsafe { GetWindowLongPtrW(self.hwnd,
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/// GWLP_USERDATA) } as *const WindowState`.
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@ -458,6 +462,7 @@ struct WindowState {
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mouse_button_counter: Cell<usize>,
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// Initialized late so the `Window` can hold a reference to this `WindowState`
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handler: RefCell<Option<Box<dyn WindowHandler>>>,
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_drop_target: RefCell<Option<Rc<DropTarget>>>,
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scale_policy: WindowScalePolicy,
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dw_style: u32,
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@ -473,10 +478,22 @@ struct WindowState {
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}
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impl WindowState {
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fn create_window(&self) -> Window {
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pub(super) fn create_window(&self) -> Window {
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Window { state: self }
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}
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pub(super) fn window_info(&self) -> Ref<WindowInfo> {
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self.window_info.borrow()
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}
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pub(super) fn keyboard_state(&self) -> Ref<KeyboardState> {
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self.keyboard_state.borrow()
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}
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pub(super) fn handler_mut(&self) -> RefMut<Option<Box<dyn WindowHandler>>> {
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self.handler.borrow_mut()
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}
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|
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/// Handle a deferred task as described in [`Self::deferred_tasks
|
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pub(self) fn handle_deferred_task(&self, task: WindowTask) {
|
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match task {
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|
|
@ -517,7 +534,7 @@ impl WindowState {
|
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/// Tasks that must be deferred until the end of [`wnd_proc()`] to avoid reentrant `WindowState`
|
||||
/// borrows. See the docstring on [`WindowState::deferred_tasks`] for more information.
|
||||
#[derive(Debug, Clone)]
|
||||
enum WindowTask {
|
||||
pub(super) enum WindowTask {
|
||||
/// Resize the window to the given size. The size is in logical pixels. DPI scaling is applied
|
||||
/// automatically.
|
||||
Resize(Size),
|
||||
|
|
@ -654,7 +671,7 @@ impl Window<'_> {
|
|||
let (parent_handle, window_handle) = ParentHandle::new(hwnd);
|
||||
let parent_handle = if parented { Some(parent_handle) } else { None };
|
||||
|
||||
let window_state = Box::new(WindowState {
|
||||
let window_state = Rc::new(WindowState {
|
||||
hwnd,
|
||||
window_class,
|
||||
window_info: RefCell::new(window_info),
|
||||
|
|
@ -664,6 +681,7 @@ impl Window<'_> {
|
|||
// The Window refers to this `WindowState`, so this `handler` needs to be
|
||||
// initialized later
|
||||
handler: RefCell::new(None),
|
||||
_drop_target: RefCell::new(None),
|
||||
scale_policy: options.scale,
|
||||
dw_style: flags,
|
||||
|
||||
|
|
@ -711,7 +729,13 @@ impl Window<'_> {
|
|||
None
|
||||
};
|
||||
|
||||
SetWindowLongPtrW(hwnd, GWLP_USERDATA, Box::into_raw(window_state) as *const _ as _);
|
||||
let drop_target = Rc::new(DropTarget::new(Rc::downgrade(&window_state)));
|
||||
*window_state._drop_target.borrow_mut() = Some(drop_target.clone());
|
||||
|
||||
OleInitialize(null_mut());
|
||||
RegisterDragDrop(hwnd, Rc::as_ptr(&drop_target) as LPDROPTARGET);
|
||||
|
||||
SetWindowLongPtrW(hwnd, GWLP_USERDATA, Rc::into_raw(window_state) as *const _ as _);
|
||||
SetTimer(hwnd, WIN_FRAME_TIMER, 15, None);
|
||||
|
||||
if let Some(mut new_rect) = new_rect {
|
||||
|
|
|
|||
Loading…
Reference in a new issue