RaylibIMEInputSampleApp/TextEditor.c at master · clear-code/RaylibIMEInputSampleApp · GitHub

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// Copyright (C) 2022 Daijiro Fukuda <fukuda@clear-code.com>

// This file is part of RaylibIMEInputSampleApp.

// RaylibIMEInputSampleApp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// RaylibIMEInputSampleApp is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

#include"TextEditor.h"

#include"TextureManager.h"
#include"PreeditManager.h"

#defineMAX_TEXT_NUM 1024

staticints_FontSize=16;

staticints_PosX;
staticints_PosY;
staticints_Width;
staticints_Height;

staticTextureManagers_TextureManagerForCommitted;

staticints_TextCommitted[MAX_TEXT_NUM];
staticints_TextCommittedNum=0;

staticTexture2Ds_TextureCommitted;

staticTextureManagers_TextureManagerForPreedit;
staticTexture2Ds_TexturePreedit;

staticbools_NeedToUpdateTexture= false;

#ifdefMANAGE_PREEDIT_CANDIDATE
staticTextureManagers_TextureManagerForCandidate;
staticTexture2Ds_TexturePreeditCandidate;
staticvoidOnPreeditCandidateChanged(int**candidates, int*lengths, intpageSize, intselectedIndex)
 {
s_TexturePreeditCandidate=TextureManager_CreateTextureForCandidate(&s_TextureManagerForCandidate, candidates, lengths, pageSize, selectedIndex);
 }
#endif

staticvoidOnPreeditChanged(int*preedit, intlength)
{
s_TexturePreedit=TextureManager_CreateTexture(&s_TextureManagerForPreedit, preedit, length);
}

staticintCursorHight()
{
// It might be possible to get this padding from FreeType, but I don't know how.
constintpadding=2;
returns_FontSize+padding;
}

boolTextEditor_Init(intposX, intposY, intwidth, intheight)
{
s_PosX=posX;
s_PosY=posY;
s_Width=width;
s_Height=height;

boolhasSucceeded=TextureManager_Initialize(&s_TextureManagerForCommitted, s_Width, s_Height, s_FontSize);
if (!hasSucceeded)
 {
printf("Error: TextureManager failed to initialize.\n");
return false;
 }
hasSucceeded=TextureManager_Initialize(&s_TextureManagerForPreedit, 400, 200, s_FontSize);
if (!hasSucceeded)
 {
printf("Error: TextureManager failed to initialize.\n");
return false;
 }

PreeditManager_Init();
PreeditManager_UpdateCursorRectangle(s_PosX, s_PosY, 1, CursorHight());
PreeditManager_SetOnPreeditChanged(OnPreeditChanged);

#ifdefMANAGE_PREEDIT_CANDIDATE
hasSucceeded=TextureManager_Initialize(&s_TextureManagerForCandidate, 400, 400, s_FontSize);
if (!hasSucceeded)
 {
printf("Error: TextureManager failed to initialize.\n");
return false;
 }

PreeditManager_SetOnPreeditCandidateChanged(OnPreeditCandidateChanged);
#endif

return true;
}

voidTextEditor_Update()
{
intunicodePoint=GetCharPressed();
while (unicodePoint>0)
 {
if (unicodePoint >= 32&&s_TextCommittedNum<MAX_TEXT_NUM)
 {
s_TextCommitted[s_TextCommittedNum++] =unicodePoint;
s_NeedToUpdateTexture= true;
 }

unicodePoint=GetCharPressed();
 }

if (IsKeyPressed(KEY_BACKSPACE) &&s_TextCommittedNum>0)
 {
s_TextCommittedNum--;
s_NeedToUpdateTexture= true;
 }
}

voidTextEditor_Draw()
{
if (s_NeedToUpdateTexture)
 {
s_TextureCommitted=TextureManager_CreateTexture(&s_TextureManagerForCommitted, s_TextCommitted, s_TextCommittedNum);
PreeditManager_UpdateCursorRectangle(s_PosX+s_TextureManagerForCommitted.m_CursorPosX,
s_PosY+s_TextureManagerForCommitted.m_CursorPosY,
1,
CursorHight());
s_NeedToUpdateTexture= false;
 }

DrawRectangleLines(s_PosX, s_PosY, s_Width, s_Height, BLACK);
DrawTexture(s_TextureCommitted, s_PosX, s_PosY, WHITE);
DrawTexture(s_TexturePreedit,
s_PosX+s_TextureManagerForCommitted.m_CursorPosX,
s_PosY+s_TextureManagerForCommitted.m_CursorPosY,
WHITE);

#ifdefMANAGE_PREEDIT_CANDIDATE
DrawTexture(s_TexturePreeditCandidate,
s_PosX+s_TextureManagerForCommitted.m_CursorPosX,
s_PosY+s_TextureManagerForCommitted.m_CursorPosY+s_FontSize+10,
WHITE);
#endif
}