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75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
#pragma once
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// MIT license, see LICENSE
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// Copyright(c) 2021 adzm / Adam D. Walling
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// processes messages related to UAH / custom menubar drawing.
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// return true if handled, false to continue with normal processing in your wndproc
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bool UAHDarkModeWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam, LRESULT* lr);
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// window messages related to menu bar drawing
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#define WM_UAHDESTROYWINDOW 0x0090 // handled by DefWindowProc
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#define WM_UAHDRAWMENU 0x0091 // lParam is UAHMENU
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#define WM_UAHDRAWMENUITEM 0x0092 // lParam is UAHDRAWMENUITEM
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#define WM_UAHINITMENU 0x0093 // handled by DefWindowProc
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#define WM_UAHMEASUREMENUITEM 0x0094 // lParam is UAHMEASUREMENUITEM
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#define WM_UAHNCPAINTMENUPOPUP 0x0095 // handled by DefWindowProc
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// describes the sizes of the menu bar or menu item
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typedef union tagUAHMENUITEMMETRICS
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{
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// cx appears to be 14 / 0xE less than rcItem's width!
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// cy 0x14 seems stable, i wonder if it is 4 less than rcItem's height which is always 24 atm
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struct {
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DWORD cx;
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DWORD cy;
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} rgsizeBar[2];
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struct {
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DWORD cx;
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DWORD cy;
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} rgsizePopup[4];
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} UAHMENUITEMMETRICS;
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// not really used in our case but part of the other structures
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typedef struct tagUAHMENUPOPUPMETRICS
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{
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DWORD rgcx[4];
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DWORD fUpdateMaxWidths : 2; // from kernel symbols, padded to full dword
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} UAHMENUPOPUPMETRICS;
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// hmenu is the main window menu; hdc is the context to draw in
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typedef struct tagUAHMENU
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{
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HMENU hmenu;
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HDC hdc;
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DWORD dwFlags; // no idea what these mean, in my testing it's either 0x00000a00 or sometimes 0x00000a10
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} UAHMENU;
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// menu items are always referred to by iPosition here
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typedef struct tagUAHMENUITEM
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{
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int iPosition; // 0-based position of menu item in menubar
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UAHMENUITEMMETRICS umim;
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UAHMENUPOPUPMETRICS umpm;
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} UAHMENUITEM;
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// the DRAWITEMSTRUCT contains the states of the menu items, as well as
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// the position index of the item in the menu, which is duplicated in
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// the UAHMENUITEM's iPosition as well
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typedef struct UAHDRAWMENUITEM
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{
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DRAWITEMSTRUCT dis; // itemID looks uninitialized
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UAHMENU um;
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UAHMENUITEM umi;
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} UAHDRAWMENUITEM;
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// the MEASUREITEMSTRUCT is intended to be filled with the size of the item
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// height appears to be ignored, but width can be modified
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typedef struct tagUAHMEASUREMENUITEM
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{
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MEASUREITEMSTRUCT mis;
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UAHMENU um;
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UAHMENUITEM umi;
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} UAHMEASUREMENUITEM;
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