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browser_window_drag_linux.go
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browser_window_drag_linux.go
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//----------------------------------------
//
// Copyright © yanghy. All Rights Reserved.
//
// Licensed under Apache License Version 2.0, January 2004
//
// https://www.apache.org/licenses/LICENSE-2.0
//
//----------------------------------------
//go:build linux
// +build linux
package cef
import (
"github.com/energye/energy/v2/cef/internal/ipc"
ipcArgument "github.com/energye/energy/v2/cef/ipc/argument"
"strconv"
)
// 窗口拖拽JS扩展
// 在这里执行并启用JS拖拽
func dragExtensionJS(frame *ICefFrame, drag bool) {
// MacOS只在LCL窗口中使用自定义窗口拖拽, VF窗口默认已实现
// 在MacOS中LCL窗口没有有效的消息事件
var executeJS = `
energyExtension.drag.setEnableDrag(` + strconv.FormatBool(drag) + `);
energyExtension.drag.setup();`
frame.ExecuteJavaScript(executeJS, "", 0)
}
// 窗口拖拽JS扩展处理器
// 1. 注册JS扩展到CEF, 注册鼠标事件,通过本地函数在Go里处理鼠标事件
// 2. 通过IPC将鼠标消息发送到主进程,主进程监听到消息处理鼠标事件
// 3. macos 使用窗口坐标实现窗口拖拽
func dragExtensionHandler() {
energyExtensionHandler := V8HandlerRef.New()
energyExtensionHandler.Execute(func(name string, object *ICefV8Value, arguments *TCefV8ValueArray, retVal *ResultV8Value, exception *ResultString) bool {
if name == mouseUp {
message := &ipcArgument.List{
Id: -1,
BId: ipc.RenderChan().BrowserId(),
Name: internalIPCDRAG,
Data: &drag{T: dragUp},
}
ipc.RenderChan().IPC().Send(message.Bytes())
return true
} else if name == mouseDown {
var dx, dy int32
if arguments.Size() > 0 {
point := arguments.Get(0)
v8ValX := point.getValueByKey("x")
v8ValY := point.getValueByKey("y")
dx = v8ValX.GetIntValue()
dy = v8ValY.GetIntValue()
v8ValX.Free()
v8ValY.Free()
point.Free()
}
message := &ipcArgument.List{
Id: -1,
BId: ipc.RenderChan().BrowserId(),
Name: internalIPCDRAG,
Data: &drag{T: dragDown, X: dx, Y: dy},
}
ipc.RenderChan().IPC().Send(message.Bytes())
return true
} else if name == mouseMove {
var mx, my int32
if arguments.Size() > 0 {
point := arguments.Get(0)
v8ValX := point.getValueByKey("x")
v8ValY := point.getValueByKey("y")
mx = v8ValX.GetIntValue()
my = v8ValY.GetIntValue()
v8ValX.Free()
v8ValY.Free()
point.Free()
}
message := &ipcArgument.List{
Id: -1,
BId: ipc.RenderChan().BrowserId(),
Name: internalIPCDRAG,
Data: &drag{T: dragMove, X: mx, Y: my},
}
ipc.RenderChan().IPC().Send(message.Bytes())
return true
}
return false
})
var code = `
let energyExtension;
if (!energyExtension) {
energyExtension = {
drag: {
enableDrag: false,
shouldDrag: false,
cssDragProperty: "--webkit-app-region",
cssDragValue: "drag",
defaultCursor: null
},
};
}
(function () {
energyExtension.drag.war = function (e) {
let v = window.getComputedStyle(e.target).getPropertyValue(energyExtension.drag.cssDragProperty);
if (v) {
v = v.trim();
if (v !== energyExtension.drag.cssDragValue || e.buttons !== 1) {
return false;
}
return e.detail === 1;
}
return false;
}
energyExtension.drag.mouseMove = function (e) {
if (!energyExtension.drag.enableDrag || !energyExtension.drag.shouldDrag) {
return
}
native function mouseMove();
mouseMove({x: e.screenX, y: e.screenY});
}
energyExtension.drag.mouseUp = function (e) {
if (!energyExtension.drag.enableDrag || !energyExtension.drag.shouldDrag) {
return
}
energyExtension.drag.shouldDrag = false;
//document.body.style.cursor = "default";
native function mouseUp();
mouseUp();
}
energyExtension.drag.mouseDown = function (e) {
if (!energyExtension.drag.enableDrag || ((e.offsetX > e.target.clientWidth || e.offsetY > e.target.clientHeight))) {
return
}
if (energyExtension.drag.war(e)) {
e.preventDefault();
energyExtension.drag.shouldDrag = true;
native function mouseDown();
mouseDown({x: e.screenX, y: e.screenY});
} else {
energyExtension.drag.shouldDrag = false;
}
}
energyExtension.drag.setEnableDrag = function (v) {
energyExtension.drag.enableDrag = v;
}
energyExtension.drag.setup = function () {
if (!energyExtension.drag.enableDrag) {
return;
}
window.addEventListener("mousemove", energyExtension.drag.mouseMove);
window.addEventListener("mousedown", energyExtension.drag.mouseDown);
window.addEventListener("mouseup", energyExtension.drag.mouseUp);
}
})();
`
RegisterExtension("energyExtension", code, energyExtensionHandler)
}
func (m *drag) drag() {
if m.T == dragUp {
if m.window.IsLCL() {
bw := m.window.AsLCLBrowserWindow().BrowserWindow()
bw.drag = nil
m.window = nil
}
} else if m.T == dragDown {
m.dx = m.X
m.dy = m.Y
point := m.window.Point()
m.wx = point.X
m.wy = point.Y
} else if m.T == dragMove {
m.mx = m.X
m.my = m.Y
if m.window.IsLCL() {
x := m.wx + (m.mx - m.dx)
y := m.wy + (m.my - m.dy)
m.window.SetPoint(x, y)
}
}
}